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The Payload Development and the Experiments for Studying Thermocapillary Convection in TG-2 Liquid Bridge Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-23 Li Duan, Qi Kang, Jianquan Zhang, Xiang Li, Liang Hu, Bin Zhou, Lujun Li, Di Wu, Jia Wang, Pu Zhang
The development of space experiment payload for studying thermocapillary convection in the liquid bridge with large Pr number on TG-2 space laboratory as well as the experiments are presented in detail in this paper, and the objectives of the space experiments are confirmed. The functions of the payload are analyzed, and the technical and engineering specifications are determined. Detailed designs
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Quantitative Evaluation of a Telerobotic System for Vascular Ultrasound Measurement on a Short Arm Human Centrifuge Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-23 Timo Frett, Guido Petrat, Michael Arz, Carole Leguy
Artificial Gravity generated by Short Arm Human Centrifuges is a promising multi-system countermeasure for physiological deconditioning during long duration space flights. To allow a continuous assessment of cardiovascular hemodynamics during centrifugation, a telerobotic robotic system holding an ultrasound probe has been installed on a Short Arm Human Centrifuge. A feasibility study was conducted
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Thermocapillary Flow Instabilities in a Rotating Annular Pool for Moderate-Prandtl-number Fluid Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-20 Hao Liu, Zhong Zeng, Zhouhua Qiu, Linmao Yin, Yao Xiao
The linear stability of thermocapillary flow in a rotating annular pool at intermediate Prandtl number (Pr = 1.4) was studied over a wide range of rotation rate. The critical Marangoni number for the onset of flow instability was determined using linear stability analysis based on the spectral element method. The results indicate that the pool rotation can stabilize the thermocapillary flow and affect
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ESA/ELGRA Gravity-Related Research Summer School: an Introduction to Microgravity and Hypergravity Research for University Students Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-20 Natacha Callens, Philip Carvil, Merel Van Walleghem, Ricard González-Cinca
The European Low Gravity Research Association (ELGRA) and the European Space Agency (ESA) co-organise since 2016 a Summer School on gravity-related research in the frame of ESA Academy’s Training and Learning Programme. This Summer School is organised every year, in June, at the ESA Education Training Centre located in ESA’s European Space Security and Education Centre (ESEC), Belgium. The Summer School
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Characteristics of a Magnetic Bulk Thermostat for Granular Gas Investigations in Microgravity Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-18 Masato Adachi, Michael Balter, Xiang Cheng, Jörg Drescher, Xiaotian Li, Matthias Sperl, Shaofan Zhao, Peidong Yu
A magnetic thermostat employing soft-ferromagnetic particles and a varying magnetic field has been developed to investigate a homogeneous granular gas system in microgravity. While the thermostat’s mechanism of creating homogeneous distribution of the particles was shown earlier, its characteristics have not been understood well due to limited access to a microgravity environment. Therefore, a parametric
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Sensitivity of Plant Plasma Membrane to Simulated Microgravity Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-14 О. Nedukha, E. Kordyum, T. Vorobyova
Biological membranes, especially the plasma membrane, are considered to be the most sensitive to altered gravity in regard to their properties and functions. We studied the composition and content of lipids, fatty acids and sterols in the plasma membrane fractions isolated from epicotyls and roots of Pisum sativum seedlings grown during 7 days under simulated microgravity by slow clinorotation. We
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Numerical Study on the Heat Transfer Characteristics of Axially Grooved Heat Pipe Assisted by Gravity Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-13 Feng Yao, Cheng Yu, Xuejie Li, Chaoqun Shen
The theoretical model of the evaporation and condensation heat transfer process of the axially grooved heat pipe (AGHP) assisted by gravity under small angle inclination is established to investigate the evaporation regimes and the heat transfer characteristics of AGHP. To reveal the heat transfer mechanism of the AGHP, the working state and gas-liquid interface distribution of the AGHP with different
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Mechanisms of the Effect of Simulated Microgravity on the Cytotoxicity of NK Cells Following the DNA Methylation of NKG2D and the Expression of DAP10 Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-07 Dongyan Shao, Linjie Ye, Bobo Zhu, Qi Li, Hui Yang, Junling Shi, Qingsheng Huang, Wen Zhao
The inhibition of the cytotoxicity of NK cells by microgravity in space is of serious concern to the health of astronauts. However, there remains a lack of in-depth research into the mechanisms of action of this suppression. In the present study, the effects of simulated microgravity (SMG) on the morphology, survival rate and the ability of NK cells to kill were studied initially and then the mechanism
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Thermal Performance of an Axially Grooved Heat Pipe Subjected to Multiple Heating Sources Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-07 Feng Yao, Naipu Bian, Yujuan Xia, Wei Chen, Renping Zhang
An experiment of axial temperature test for a heat pipe subjected to discrete heating sources is performed for deep understanding of the thermal characteristics of axial dovetail grooved heat pipe during the unsteady and steady state. The influences of heating length, heating source position, source configurations and incline angle on the temperature profiles, heat transfer limit of the heat pipe under
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Steady thermocapillary droplet migration under thermal radiation with a uniform flux Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-07 Jia-Hao Gao, Zuo-Bing Wu
Thermocapillary migration of a droplet under thermal radiation with a uniform flux is numerically investigated and theoretically analyzed. By using the front-tracking method, it is observed that thermocapillary droplet migration at small Reynolds numbers and moderate Marangoni numbers reaches a steady process. The steady migration velocity decreases as Marangoni number increases. The time-evolution
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Multi-Position Calibration Method of Gyroscopes in Inertial Measurement Unit Based on Centrifuge with Position Platform Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-07 Shi-ming Wang, Dong Chen, Ni Meng
In order to accurately calibrate the static error model coefficients of three gyroscopes simultaneously, especially the higher-order coefficients, in an inertial measurement unit, an optimal 16-position method is designed. Analysis is conducted using a precision centrifuge with a counter-rotating platform, and coordinate systems are established on centrifuge. Thus, centrifuge error sources, which may
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Selective Transport of Airborne Microparticles Through Micro-channels Under Microgravity Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-05 Monia Makhoul, Philippe Beltrame
This paper analyzes the possibility of obtaining the selective transport of microparticles suspended in air in a microgravity environment through modulated channels without net displacement of air. Using numerical simulation and bifurcation analysis tools, we show the existence of intermittent particle drift under the Stokes assumption of the fluid flow. The particle transport can be selective and
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A Solute Flux Near a Solid Wall as a Reason for the Observation of Anomalous Transport Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-05 Boris S. Maryshev, Lyudmila S. Klimenko
The paper is devoted to the study of the reasons of anomalous transport observation in the experiments with microchannels. Usually, retardation of such transport is associated with the interaction of solute particles with channel walls. In the present paper, we have shown that the viscous interaction of the flow and solid wall can be the reason for the anomalous transport observation. It was illustrated
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Sensitivity Modeling and Enhancement for Space-Based Gravitational Wave Detector with Optical Atomic Clocks under Solar Radiation Disturbance Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-04 Jian Liang, Lei Liu, Shuo Tang
The space-based gravitational wave detectors at low frequencies has received great attention recently. Due to lack of considering the relative motion between spacecrafts, the accuracy of current sensitivity models is inadequate for space-based gravitational wave detectors. In this paper, an accurate sensitivity model of the space-based gravitational wave detector is established by taking into account
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Analysis of Noisy Radiometer Data from ISS Reduced Gravity Droplet Combustion Experiments Microgravity Sci. Technol. (IF 1.845) Pub Date : 2021-01-04 Sreedev Das, Benjamin D. Shaw
Reduced gravity droplet combustion experiments were performed on the International Space Station (ISS). The data from these droplet combustion experiments have been made publicly available by NASA. These experiments utilized narrow-band and wide-band radiometers to measure thermal radiation heat fluxes from flames. The initial set of radiometers, which were used in 80 experiments, exhibited large noise
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Onset of Rayleigh-Benard Convection with Periodic Boundary Temperatures Using Weakly Nonlinear Theory Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-11-09 Arun Kumar, V. R. K. Raju, S. Das
This paper investigates the Rayleigh Benard instability of a viscous, Newtonian, Boussinesq fluid with time-periodic boundary temperature modulation using the framework of weakly nonlinear theory. Critical Rayleigh number is computed for asymptotic stability criterion using the energy method accompanied by variational algorithm. Subcritical instability is found to occur under two conditions: when modulation
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Phase Separation in Porous Media Integrated Capillary Channels Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-11-09 Kamal S. Bisht, Michael E. Dreyer
Phase separation in space is critical for gas-free propellant supply, life support systems, refueling of spacecraft in low earth orbit (LEO), and for deep space exploration missions. In the absence of gravity, the stability of the liquid-gas interface depends on capillary forces. High liquid flow rates, sudden accelerations, and vibrational disturbances can cause the free surface of the liquid to collapse
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Dynamics of an Electrified Multi-layer Film Down a Porous Incline Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-11-05 Magdy A. Sirwah, Ahmed Assaf
The nonlinear dynamics of gravity-driven two-layers flow through an oblique microchannel of porous walls subjected to an external electric potential is examined. The evolution equation governing the surface wave deflection is derived in the frame of long wave theory. The stability criteria of the linearized system are investigated. As permeability, inclination or dielectric constant increase, the disturbances
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Thermodiffusion in Electrolyte Between Electric Membranes Under External Electric Field Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-11-02 Nataly Ganchenko, Maria Repina, Georgy Ganchenko, Evgeny Demekhin
Thermodiffusion of a binary electrolyte situated in the microgap between two ion-selective surfaces under external electric field is theoretically studied. It is assumed that temperature gradient occurs only by Joule heating of the electrolyte; and the concentration gradient may trigger an inner gravitational instability. There are three types of instability in such setup: electrokinetic, thermoelectrokinetic
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Effects of Gravitational Force and Surface Orientation on the Jumping Velocity and Energy Conversion Efficiency of Coalesced Droplets Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-10-30 Xin Wang, Bo Xu, Zhenqian Chen, Yang Yang, Qian Cao
Due to potential applications in numerous fields (self-cleaning, anti-frosting, condensation enhancement, etc.), coalescence-induced droplet jumping has been investigated extensively by numerical simulations and experiments over the past decade. In this paper, the jumping dynamics of coalesced droplets on the microstructured superhydrophobic surfaces is simulated using the lattice Boltzmann model.
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Quasi-Adiabatic External State Preparation of Ultracold Atoms in Microgravity Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-10-21 A. R. Pollard, E. R. Moan, C. A. Sackett, E. R. Elliott, R. J. Thompson
The Cold Atom Laboratory on the International Space Station produces ultracold gases of rubidium and potassium in a tight magnetic trap near the surface of a magnetic chip. In order to use these samples in long-duration field-free experiments, the atoms must be moved away from the chip, expanded to larger volume, and released from the trap. We describe how these goals can be achieved using quasi-adiabatic
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Acoustic Manipulation of Dense Nanorods in Microgravity Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-10-19 Gabriel Dumy, Nathan Jeger-Madiot, Xavier Benoit-Gonin, Thomas E. Mallouk, Mauricio Hoyos, Jean-Luc Aider
Because the absence of sedimentation in zero-gravity makes the culture and the manipulation of cells or particles challenging, an attractive alternative is to use the Acoustic Radiation Force (ARF) as an artificial “acoustic gravity.” To evaluate the potential of this approach we studied the behavior of dense gold nanorods under ARF during a parabolic flight campaign. Using dense objects enhances the
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Phenomenological Investigation of Drop Manipulation Using Surface Acoustic Waves Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-10-18 Mahdi Sheikholeslam Noori, Arash Shams Taleghani, Mohammad Taeibi Rahni
This paper aims at the investigation of acoustic streaming produced by surface acoustic waves (SAWs) in a drop. Computational simulation of acoustofluidic phenomenon, using lattice Boltzmann method (LBM), presenting acoustic applications in flow control, and a relatively complete parametric study are the motivations of this work. For this purpose, a computational fluid dynamics modeling based on multi-relaxation
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Theoretical and Experimental Study of Thermal Convection in Rotating Horizontal Annulus Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-10-14 Aleksey Vjatkin, Ramil Siraev, Victor Kozlov
The paper presents the results of theoretical and experimental studies of thermal convection in a rotating horizontal cylindrical liquid layer. A layer with boundaries of different temperatures both when heating from inside and outside is considered. Steady thermal convection is determined by two mechanisms: thermovibrational and centrifugal ones. The first one appears due to oscillations of nonisothermal
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Experimental Characterization of Weightlessness During Glider Parabolic Flights Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-10-10 Denis-Gabriel Caprace, Camille Gontier, Mohammad Iranmanesh, Mehdi Scoubeau, Vladimir Pletser
Access to earthbound weightlessness is critical to many branches of applied sciences. Besides, several space systems require microgravity testing before their launch. Existing solutions (drop towers, parabolic flights, sounding rockets) offer variable durations and qualities of microgravity environment, but their cost and lead times make them unpractical for small actors such as universities or start-up
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The FixBox: Hardware to Provide on-Orbit Fixation Capabilities to the EMCS on the ISS Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-10-06 Aránzazu Manzano, Eva Creus, Albert Tomás, Miguel A. Valbuena, Alicia Villacampa, Malgorzata Ciska, Richard E. Edelmann, John Z. Kiss, F. Javier Medina, Raúl Herranz
Plant biology is an important area for the future of space exploration, but biological spaceflight experiments have been always constrained by the hardware capabilities. The European Modular Cultivation System (EMCS) unit was an incubator for small organisms, such as Arabidopsis thaliana, built by the European Space Agency (ESA) and was decommissioned in 2018. Here, we describe the FixBox system as
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Drop Tower Experiment to Study the Effect of Microgravity on Friction Behavior: Experimental Set-up and Preliminary Results Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-10-04 Yong Duan, Shengguan Qu, Chao Yang, Xiaoqiang Li, Fucai Liu
This paper refers to studying the effect of microgravity on the friction behavior of friction units and to further analyzing the influencing mechanism. The potential factors affecting the friction behavior of the moving joints of space mechanisms in microgravity environment were analyzed. A friction apparatus was designed and manufactured by reducing the complexity and costs. A microgravity test program
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Spatial Waveform Analysis of Ultrasonically Excited Capillary Waves for Measurements of Interfacial Tension Coefficient in Microgravity Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-10-03 Leonid Krutyansky, Farzam Zoueshtiagh, Philippe Pernod
A simplified method for measurements of low interfacial tension coefficient which is applicable for binary mixtures is proposed. The technique is based on generating progressive capillary waves at a liquid interface by radiation pressure of a short ultrasound pulse in microgravity condition. The waveforms are then processed in the spatial domain. The method presents the advantage of strongly reducing
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Gravity-Independent Experimental Study on a High-Speed Rotor Supported by Aerostatic Bearings Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-09-30 Chengjun Rong, Hong Wu, Yulong Li, Huaqi Lian, Xianghua Xu, Xingang Yu
Vapor compression heat pump technology has great potential in future space thermal management application. Considering microgravity in space, this paper proposes using aerostatic bearings for the lubrication of the heat pump compressor. An experimental apparatus was built to study the performance of a rotor supported by aerostatic bearings subjected to microgravity. The gravity-independent experiment
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Flame Extinction of Spherical PMMA in Microgravity: Effect of Fuel Diameter and Conduction Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-09-28 Chuanjia Wu, Peiyi Sun, Xiuzhen Wang, Xinyan Huang, Shuangfeng Wang
A series of experiments were conducted in the 3.6-s microgravity drop tower and normal gravity to investigate the effect of solid fuel curvature, conduction, and reradiation on the flame extinction of spherical polymethyl methacrylate (PMMA). In the semi-quiescent microgravity environment, flame extinction was observed if the PMMA diameter was larger than 40 mm, because of a smaller flame conductive
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Surface Properties of Liquid Al-Ni Alloys: Experiments Vs Theory Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-09-25 R. Novakovic, M. Mohr, D. Giuranno, E. Ricci, J. Brillo, R. Wunderlich, I. Egry, Yu Plevachuk, H.-J. Fecht
The present study is an overview of the surface properties of liquid Al-Ni alloys, which are of great importance for the design and development of new Al-Ni and Ni-based industrial alloys, widely used as functional and structural materials. The solidification and thus, the microstructural evolution are directly dependent on the interface/surface properties of metallic melts. Therefore, numerical simulation
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Dynamic Behavior in a Storage Tank in Reduced Gravity Using Dynamic Contact Angle Method Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-09-25 Ji-Cheng Li, Hai Lin, Kai Li, Jian-Fu Zhao, Wen-Rui Hu
The oscillation of liquid/gas free surface in a partially filled storage tank caused by an abrupt drop of gravity level is of critical importance for the fluid management in space. In the present study, the dynamic behavior of free surfaces in a model tank (tube) is numerically investigated using volume of fluid (VOF) method in the context of dynamic contact angle (DCA) model. It is concluded that
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A Similarity Solution for Natural Convection Flow near a Vertical Plate with Thermal Radiation Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-09-23 Basant K. Jha, Gabriel Samaila
This paper examined the fluid transport on boundary layer near a vertical wall with thermal radiation effect. The coupled nonlinear partial differential equations are reduced to a system of ordinary differential equations through similarity transformation. The resultant system of ordinary differential equations is integrated with maple software using RKF45 method. The effect of the active parameters
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Cross Diffusion and Internal Heat Generation Effects on Mixed Convection of Non-Newtonian Fluids Flow Adjacent to a Vertical VHF/VMF Wedge in Porous Media: the Entire Regime Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-09-22 Kuo-Ann Yih, Chuo-Jeng Huang
The problem of cross diffusion (Soret/Dufour) and internal heat generation effects on combined convection flow of non-Newtonian fluids flow over the vertical wedge in a saturated porous medium with the entire regime is solved numerically. The internal heat generation is assumed to be an exponential decaying form. The power law model of Ostwald-de-Waele for non-Newtonian fluids is considered here. The
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Sloshing Dynamics in 2D Multi-Baffled Containers Under Low-Gravity Conditions Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-09-21 M. Ebrahimian, M. A. Noorian, M. Javadi
The sloshing free vibrations and the Equivalent Mechanical Model (EMM) parameters are determined for 2D multi-baffled containers under low-gravity conditions using Boundary Element Method (BEM) and potential flow model of the fluid. The presented model is applicable to any values of the acceleration of gravity and surface tension and to constant cross-section containers with arbitrary geometry, and
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Dynamics of Two-liquid System at Rotation and Vibration with Equal Frequencies Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-08-29 Ivan Karpunin, Nikolai Kozlov
The impact of vibrations on the dynamics of a system of two immiscible liquids filling a rotating container is studied experimentally. A horizontal cylindrical container is rotating at a rate sufficient for the liquids, whose densities are not equal, to become steadily distributed in the form of core and annulus. The vibrational motion of the container has a frequency virtually equal to that of rotation
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Onset and Nonlinear Regimes of Convection of a Binary Mixture in Rectangular Cavity Heated from Below Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-08-18 Tatyana Lyubimova, Kseniya Rushinskaya, Nadezhda Zubova
The paper is devoted to numerical simulation of nonlinear regimes of a binary liquid mixture in rectangular cavities elongated in the horizontal direction. The boundaries of the cavity are considered to be rigid, impermeable to the substance. The vertical boundaries are thermally insulated; constant different temperatures corresponding to heating from below are maintained on the horizontal boundaries
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Stability of Thermocapillary Flow in High-Prandtl-Number Liquid Bridges Exposed to a Coaxial Gas Stream Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-08-11 Mario Stojanovic, Hendrik C. Kuhlmann
The stability of thermocapillary flow in a liquid bridge made from 5cSt silicone oil (Pr = 68) is computed numerically. To improve the numerical model as compared to the standard approach, we consider the flow in the liquid bridge fully coupled to the flow in the ambient gas, temperature-dependent material parameters, and a dynamically deforming liquid–gas interface. We address the full two-phase-flow
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Development of Control Algorithms for the Orbital Motion of a Small Technological Spacecraft with a Shadow Portion of the Orbit Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-08-06 A. V. Sedelnikov, D. I. Orlov
The paper proposes algorithms for controlling the orbital motion of a small spacecraft for executive bodies with constant and variable thrust. The developed algorithms are aimed at neutralizing the influence of temperature shock on the level of microaccelerations in the area of technological equipment. The influence of the most significant part of the disturbances associated with a change in the size
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Exploration of Direct-Ink-Write 3D Printing in Space: Droplet Dynamics and Patterns Formation in Microgravity Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-07-25 Weibin Li, Ding Lan, Yuren Wang
As a simple, fast and effective 3D printing method, direct-ink-writing (DIW) has potential applications in repairing the circuit board in orbit, printing the wearable devices for the astronaut, and producing the solar cells for the energy supply in space. To expand the DIW technology to space, we designed the colloidal material box (CMB) as the prototype printer of DIW and verified its applicability
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Microtubules and Vimentin Fiber Stability during Parabolic Flights Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-07-19 Simon L. Wuest, Jaro Arnold, Sarah Gander, Christoph Zumbühl, Christian Jost, Christina Giger-Lange, Geraldine Cerretti, Martina Caliò, Karin Rattenbacher-Kiser, Cindy Follonier, Othmar Schälli, Gerhard S. Székely, Marcel Egli, Fabian Ille
Adequate mechanical stimulation is essential for cellular health and tissue maintenance, including articular cartilage, which lines the articulating bones in joints. Chondrocytes, which are the sole cells found in articular cartilage, are responsible for matrix synthesis, maintenance and degradation. It is generally believed that chondrocytes require mechanical stimuli through daily physical activity
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Symmetry Breaking in Large Columnar Frozen Wave Patterns in Weightlessness Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-07-18 M. Troitiño, P. Salgado Sánchez, J. Porter, D. Gligor
The large columnar patterns resulting from the frozen wave instability in zero gravity conditions are investigated numerically for finite containers of immiscible liquids. The mode selection process is affected by forcing amplitude, frequency, container size and the vibroequilibria effect. The final columnar states are often approximately left-right symmetric and a quantitative measure of their asymmetry
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Machine Learning for 3D Particle Tracking in Granular Gases Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-07-18 Dmitry Puzyrev, Kirsten Harth, Torsten Trittel, Ralf Stannarius
Dilute ensembles of granular matter (so-called granular gases) are nonlinear systems which exhibit fascinating dynamical behavior far from equilibrium, including non-Gaussian distributions of velocities and rotational velocities, clustering, and violation of energy equipartition. In order to understand their dynamic properties, microgravity experiments were performed in suborbital flights and drop
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Lift Force Acting on a Heavy Cylinder and a Steady Flow in an Unevenly Rotating Container Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-07-17 Olga Vlasova, Ivan Karpunin, Maksim Solomennikov
The dynamics of a heavy cylindrical body in a horizontal cylindrical cavity filled with a viscous liquid and subjected to modulated rotation is experimentally investigated. In experiment the cylinders with different moment of inertia are used. Periodic variation (modulation) of cavity rotation rate leads to the azimuthal oscillations of the body in a uniformly rotating reference frame due to viscous
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Design, Simulation and Test of Thermal Control System of Centrifuge for Space Utilization Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-07-16 Yu Zhang; Shikui Dong; Ke Wang; Yanlin Zhou; Qiang Sheng; Heping Tan
Taking centrifuge system for space utilization as the research object, an active air-cooling thermal control system is put forward. Physical models of the centrifuge thermal control system are built on the basis of simplifying assumptions under actual conditions. A numerical calculation model of centrifuge system is established by using the sliding mesh technique and flow resistance model of heat exchanger
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Giant Fluctuations Induced by Thermal Diffusion in Complex Liquids Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-07-14 Alberto Vailati, Philipp Baaske, Henri Bataller, Serena Bolis, Marco Braibanti, Marina Carpineti, Roberto Cerbino, Fabrizio Croccolo, Jean-Luc Dewandel, Aleksandar Donev, Loreto García-Fernández, Fabio Giavazzi, Robert Haslinger, Steven Hens, Maria Knauer, Werner Köhler, Ewald Kufner, José M. Ortiz de Zárate, Jeroen Peeters, Christian J. Schwarz, Inese Silkina, Shenghua Xu, Daniel Zapf
The GRADFLEX experiment of ESA has shown that under microgravity conditions a stationary thermodiffusion process is accompanied by giant non-equilibrium fluctuations with size as large as the size of the sample. In the presence of small concentration gradients, the features of the non-equilibrium fluctuations can be described by means of linearized hydrodynamics. However, the linear models are not
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Investigation on Solutal Marangoni Convection around a Bubble under Different Gravities Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-07-09 Jia Guo, Shuai Chen, Jiahong Lan, Zhenfeng Wang, Yong Sha
The Marangoni convection during isopropanol volatilization to a single nitrogen bubble with the deformable interface is investigated by combining the Volume of Fluid model and the Level Set method. Both the deformation of the bubble and the thermal effect accompanying with the mass transfer are taken into account. The Marangoni convection is investigated under non-gravity and gravity conditions respectively
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Correction to: Numerical and Experimental Study of the Squeezing-to-Dripping Transition in a T-Junction Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-07-09 S. Arias, A. Montlaur
The original version of this article unfortunately contained mistakes introduced during the production process. In the caption of Fig. 9, “|phic” should be read as “ϕc”.
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Experimental Investigation of Single Bubble Nucleate Boiling in Microgravity Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-07-04 Iman Nejati; Axel Sielaff; Benjamin Franz; Matthias Zimmermann; Philipp Hänichen; Kai Schweikert; Julian Krempel; Peter Stephan; Anne Martin; Herbert Scheerer; Tom Engler; Matthias Oechsner
The multiscale boiling project, also known as RUBI, is an experimental project supported by the European Space Agency (ESA) focusing on the nucleate boiling within the framework of the utilization of the International Space Station (ISS). In order to investigate the operational behavior of the experimental components and determine a promising parameter range, an experimental setup with the same heater
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Steady Flows of a Fluid Oscillating in an Axisymmetric Channel of Variable Cross-Section, Versus the Dimensionless Frequency Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-06-30 Olga Vlasova; Ivan Karpunin; Dmitriy Latyshev; Victor Kozlov
The averaged flows excited by oscillations of fluid in an axisymmetric channel, which transverse section periodically changes with longitudinal coordinate, are experimentally studied. Oscillations are caused by harmonious change of a volume of the fluid, which is pumped over via the channel. Researches are executed within the broad range of dimensionless frequency which characterizes the ratio of the
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Titanium-Water Heat Pipe Radiators for Space Fission Power System Thermal Management Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-06-30 Kuan-Lin Lee; Calin Tarau; William G. Anderson; Derek Beard
For future space transportation and planetary exploration mission power applications, NASA Glenn Research Center (GRC) is currently developing a small-scale nuclear fission system (i.e. Kilopower system), which has an operable range of 1 to 10 kWe and a design life of 8 to 15 years. The thermal management system of Kilopower system involves two types of heat pipes: high temperature alkali metal heat
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Effect of Horizontal Vibrations on Thermo-Solutocapillary Convection and Free Surface of Liquid Bridge Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-06-27 Ruquan Liang, Shuang Zhao, Jungeng Fan, Shuo Zhang
In this study, effect of lateral vibrations on the thermo-solutocapillary convection and surface behavior in a liquid bridge of toluene/n-hexane solution has been studied numerically under microgravity. The Navier-Stokes equations coupled with the concentration diffusion equation are solved on a staggered grid, and the level set approach is used to capture the deformation of free surface. Present results
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Experimental Investigation on Droplet Deformation and Breakup under Uniform DC Electric Field Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-06-20 Dian Li, Tai Wang, Shuo Chen, Qingyuan Liu, Yingbai Xie, Chuntao Liu
In order to understand the dynamic behaviors of the charged water droplet in the presence of electric field, the experimental investigation is conducted in this paper. A uniform DC electric field is produced by applying high voltage between two parallel copper plates which are placed horizontally in a silicon oil tank. The variation range of the electric field intensity is 0–6.67 kV/cm. Under the influence
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Effect of Differential Rotation of Oscillating Inner Core on Steady Flow Instability in a Rotating Sphere Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-06-20 S.V. Subbotin, V.G. Kozlov
A comparative analysis of steady flow excited by an oscillating core in a rotating spherical cavity with a liquid is carried out in different cases: when the core is free and performs differential rotation, and when the core differential rotation is absent. In the cavity reference frame the core, whose density is less than the density of the liquid, oscillates near the cavity center under the action
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Numerical Simulation Analysis of Liquid Transportation in Capsule-type Vane Tank under Microgravity Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-06-18 Zhang Dazhi, Meng Li, Li Yong-Qiang
In order to research the influence of the guide vane on liquid transmission performance in a tank under microgravity, simulation analysis was carried out with FLOW-3D software. Firstly, it compared the working condition under the charging rate of 10% with the corresponding experiment results of the drop tower and validated the correctness of the simulation process. And then it changed the structure
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The Geometry of Sand Ripples in a Uniformly Rotating and Librating Horizontal Cylinder Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-06-18 Denis Polezhaev
Regular ripples at the interface between the granular medium and the fluid in a rapidly rotating cylinder are experimentally studied. We consider two types of ripple formation. First, the ripple formation in a uniformly rotating horizontal cylinder filled with granular medium, fluid and air. In this case, oscillations of the multiphase system in the rotating reference frame are excited by gravity.
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Influence of an External Perpendicular Oscillation on Stability of a Vertical Falling Liquid Film Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-06-17 Jiebin Liu, Xiaoming Yang, Rubing Ma, Yidan Yuan, Weimin Ma
A vertical falling Newtonian liquid film flow is inherently unstable to surficial long-wave disturbances. Imposing external oscillation can stabilize the long-wave instability, but also triggers additional parametric instabilities. The effect of oscillation frequency on the stability is subtle. By using the “viscosity-gravity” scaling, the effect of oscillation frequency on the stability can be investigated
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Optimization Analysis of Microgravity Experimental Facility for the Deployable Structures Based on Force Balance Method Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-06-16 Zhicheng Song, Chuanzhi Chen, Song Jiang, Jinbao Chen, Tianming Liu, WeiHua Deng, Fei Lin
Ground-based microgravity experiment facility for large deployable structures based on the force balance was used in deployment function experiments and profile precision estimations. Considering how to exert the balance force in an accurate and efficient way to reduce its adverse effects and improve the realism of the simulated space environment. In this paper, a deformation displacement model of
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On the Monitoring of the Vibratory Environment of DCMIX4 Campaign. Preliminary Results Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-06-15 D. Dubert; M. Marín-Genescà; M. J. Simón; J.M. Ezquerro; J. Massons; Jna. Gavaldà; X. Ruiz; V. Shevtsova
This work presents the preliminary characterization of the vibrational environment of the DCMIX4 thermodiffusion experiment conducted onboard the ISS from December 2018 to March 2019. Given the long duration of each one of the 58 runs of the campaign and to ensure a correct interpretation of the results, an accurate analysis of acceleration levels all along the experiment is advisable. Digital signals
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Comparison of Mixing and Displacement Ventilation under Limited Space Air Stability Conditions in a Space Capsule Microgravity Sci. Technol. (IF 1.845) Pub Date : 2020-06-13 Xiaorui Deng; Guangcai Gong
This study evaluated the performance of different ventilation methods under varying limited space air stability conditions with respect to air distribution and pollutant transport in a space capsule. Two ventilation methods were adopted: mixing ventilation (MV) and displacement ventilation (DV). A seated thermal manikin was centred in a computational domain representing the capsule in order to simulate
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