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Consideration of Backscatter Radiation from Galactic Cosmic Rays in Spacecraft Shielding Design J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-25 David Warden; Yildiz Bayazitoglu
Journal of Thermophysics and Heat Transfer, Ahead of Print.
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Thermostructural Responses of Metallic Lattice-Frame Sandwich Structure for Hypersonic Leading Edges J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-25 L. Gao; X. C. Zhao; B. Wang
Metallic lattice-frame materials, due to excellent heat transfer performance under high heat flux and mechanical property, are regarded as the potential candidates for a vehicle leading edge. This paper presents a new-style lattice-frame sandwich panel with active heat transfer wall-plate. The heat transfer performance and thermal–structural responses are numerically studied, considering the temperature-dependent
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Thermal Analysis of Calcium–Magnesium–Alumino–Silicate Infiltration Dynamics in Thermal Barrier Coatings J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-23 Timothy W. Munuhe; Liang Zhu; Ronghui Ma
Molten calcium–magnesium–alumino–silicate (CMAS) infiltration into thermal barrier coatings (TBCs) of gas turbines causes loss of strain tolerance and delamination of the ceramic topcoat. To develop efficient mitigation strategies, it is crucial to understand CMAS infiltration dynamics into the porous topcoat. This study introduces an integrated model, incorporating liquid flow in unsaturated porous
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Evaporator Disturbance Rejection in Vapor Compression Cycles with a Linear Quadratic Regulator J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-23 Sunderlin Jackson; Anthony Palazotto; Meir Pachter; Nicholas Niedbalski
Journal of Thermophysics and Heat Transfer, Ahead of Print.
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Modeling Laminar-to-Turbulent Transition in the Panel Test Facility Arcjet J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-23 Joshua R. Finkbeiner
A computational fluid dynamics (CFD) laminar-to-turbulence transition model was developed for the NASA Ames Research Center’s 20 MW Panel Test Facility (PTF). Surface pressure, heat flux to a water-cooled plate, and surface temperature on a tile plate coated with reaction-cured glass were measured across several conditions in the facility and compared with laminar and fully turbulent CFD simulations
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Performance Characteristics of the Metal Foam Wick Prepared by Magnetron Sputtering Method J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-23 Liqiu Li; Huicong Yao; Yinfeng Wang; Haijun Chen; Yuezhao Zhu
The magnetron sputtering has been used to prepare metal foam wicks for heat pipes by coating the surface of copper foam with zinc oxide (ZnO) nanoparticles. The main properties, including microscopic appearance, contact angle, and capillary performance, as well as the boiling heat transfer performance of the metal foam wicks, are characterized and tested. The results indicate that, compared with the
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Gas-Surface Energy Exchange Characterization Around a Cone in the Free-Piston-Driven Shock Tunnel J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-21 Sneh Deep; Gopalan Jagadeesh
This work describes numerical and experimental research in the Indian Hypersonic Shock Tunnel 3 on a blunt cone model and related computation of the facility parameters: nozzle reservoir conditions, nozzle transit time, and freestream conditions. Specialized codes accounting for real gas effects and nonequilibrium are used to obtain facility parameters. Starting at freestream conditions, a physicochemical
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Evaluating Enhanced Boiling Heat Transfer in a Novel Grooved Tube J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-17 Alireza Hojati; Mohammad Ali Akhavan-Behabadi; Pedram Hanafizadeh; Mohammad Fakoor
Journal of Thermophysics and Heat Transfer, Ahead of Print.
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Investigation of Fluid-Induced Vibration and Heat Transfer of Helical Elastic Coiled Tube J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-12 Jiadong Ji; Runmiao Gao; Baojun Shi; Weiqiang Chen; Jingwei Zhang
The study of fluid-induced vibration of helical elastic coiled tubes to enhance heat transfer is very important for engineering practice and energy saving. Fluid-induced vibration and enhanced heat transfer of a helical elastic coiled tube heat exchanger were analyzed based on its finite element model, by using a two-way fluid–solid coupling method. Vibration response of the helical elastic coiled
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Direct Numerical Simulation of Turbulent Heat Transfer with Slip and Temperature Jump J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-12 Amin Moosaie; Hamed Panahi-Kalus
The fully developed turbulent flow and heat transfer in a plane channel at a nominal shear Reynolds number of 180 is studied via the direct numerical simulation technique. A linear velocity-slip boundary condition is assumed on one of the channel walls, whereas the classical no-slip condition is imposed on the other wall. The heat transfer at the slip wall is assumed to occur with and without temperature
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Film Cooling Overall Effectiveness of Shaped Holes at Elevated Temperatures J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-12 David Munday; Andrew Lethander; Natalia Posada; Carol E. Bryant
Journal of Thermophysics and Heat Transfer, Ahead of Print.
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Study on Heat Transfer in Self-Excited Oscillation with Backflow Vortex Disturbance Effect J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-02-08 Gaoquan Hu; Zhaohui Wang; Quanjie Gao; Qianwen Yang; Feng Peng
The fluid motion characteristics have an important influence on the evolution of the backflow vortex near the pipe wall. The instantaneous velocity and instantaneous temperature of the outlet flow channel section, the shear stress of the outlet flow channel wall, the boundary layer thickness, and the Nusselt number under different ratios of the upstream and downstream pipe diameter are studied at the
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Local Thermal Nonequilibrium Natural Convection in a Cavity with Heat-Generating Porous Layer J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-01-28 Abderrahim Bourouis; Abdeslam Omara; Said Abboudi
Natural convection in a partially porous cavity with a heat generating source in the solid phase is studied numerically under a local thermal nonequilibrium condition. The right and left walls of the cavity are maintained at hot and cold temperatures, respectively. The horizontal walls are thermally insulated. The finite volume method and the semi-implicit method for pressure-linked equations (SIMPLER)
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Experimental Investigation of the [math] Nanofluid Heat Transfer in a Helical Coil J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-01-28 Morteza Razaghi; Ahad Abedini Esfahlani; Hadi Kargarsharifabad
Today, many attempts have been made to introduce small particles with high thermal conductivity to the heat transfer fluids to improve the thermal properties of conventional fluids used in heat transfer. Therefore, in this paper Fe3O4 nanoparticles are used as fluid additives to study properties of the laminar flow regime. So, the laboratory setup was designed to experimentally investigate the forced
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Film Cooling Performance of a Fully Cooled Vane at High Subsonic Conditions J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-01-27 Chunyi Yao; Huiren Zhu; Bolun Zhang; Cunliang Liu
This work focuses on the experimental study of the heat transfer and film cooling characteristics of a fully cooled vane under high subsonic conditions; the transient heat transfer measurements with thermocouples were employed. The inlet Reynolds numbers of the cascade ranged from 3.0×105 to 9.0×105 and the exit Mach number was 0.8. Two freestream turbulence intensities (1.3% and 14.7%) and three mass
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Loop Heat Pipe for Thermal Management of Aircraft Engine Equipment J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-01-20 Filippo Pagnoni; Vincent Ayel; Yves Bertin; Jerome Coulloux; Maxime Zebian
According to recent aircraft engine development trends, the performance enhancement of the propulsion plants is accompanied by both an increase of the overall pressure ratio and a decrease of the fan pressure ratio. Projections for the next decade show that equipment within the engine compartments can exceed their temperature thresholds, penalizing aircraft safety. Loop heat pipes (LHP) represent a
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Analytical Study on Homogeneous Nucleation and Bubble Evolution Inside Monocomponent Fuel Droplet J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-01-20 Xi Xi; Hong Liu; Chang Cai; Ming Jia; Hongchao Yin
Homogeneous nucleation and bubble evolution inside a fuel droplet trigger the occurrence of flash boiling, which shows a high potential to improve the droplet evaporation. To understand the bubble dynamic characteristics, an analytical study on homogeneous nucleation and bubble evolution has been performed, based on the flash boiling model proposed in our work. First, the nucleation rate graph of seven
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A Thirty-Fourth Successful Year for the Journal of Thermophysics and Heat Transfer J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2021-01-08 Greg F. Naterer
Journal of Thermophysics and Heat Transfer, Volume 35, Issue 1, Page 1-2, January 2021.
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Improved Analytical Solution to Viscous Dissipation Induced by Oscillating Wall in Microchannel J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-29 Chih Ping Tso; Chee Hao Hor; Gooi Mee Chen; Chee Kuang Kok
A new analysis is made on the viscous dissipation within a microchannel parallel plate gap induced by an oscillating lower plate and a stationary upper plate, assuming a one-dimensional, incompressible, laminar, Newtonian flow with constant properties. Firstly, a new form of velocity solution is obtained, which consists of a main sinusoidal term and a block of time-dependent summation terms. This is
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Particle Modeling of Reflected Shock Waves J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-29 Sergey F. Gimelshein
A direct simulation Monte Carlo based approach is proposed to model the planar shock-wave reflection in a shock tube. The approach is validated through comparisons with available time-dependent pressure and absorbance measurements of gas relaxation behind a reflected shock in an argon–oxygen gas mixture for incident shock velocities of 1–1.5 km/s. It is then used to model reacting airflows for velocities
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Plenum Pressure Behavior in Transiently Heat Loaded Transpiration Cooling System J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-29 Fabian Hufgard; Stefan Loehle; Matthew McGilvray; Tobias Hermann; Sven Schweikert; Jens von Wolfersdorf; Johan Steelant; Stefanos Fasoulas
In this paper, the behavior of the plenum pressure behind a transpiration-cooled porous material sample after an incident surface heat flux to the sample is analyzed in experiment and theory. Two porous materials, zirconium diboride and carbon/carbon, were characterized using the pressure-based noninteger system identification method. The resulting impulse responses are analyzed based on two numerical
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Experimental Study on the Cooling Film Effectiveness of a Hypersonic Blunt Body J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-21 Zhao Xinhai; Yi Shihe; Zhang Feng
This work focuses on the heat flux characteristics of a hypersonic blunt body with a tangential Mach 3 supersonic cooling film. Experiments were carried out with main flow’s Mach numbers of 6, 7, and 8; total pressure of 15 MPa, and total temperature of 2600 K. The wall surface heat flux was measured under different cooling film pressures. Nanoparticle-based planar laser scattering was used to visualize
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Performance of [math]–Vacuum Pump Oil Nanofluid in Tube with Wire Coil Inserts J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-21 A. M. Alklaibi; Lingala Syam Sundar
The thermal performance of high-Prandtl-number Fe3O4–vacuum pump oil (VPO) nanofluid with wire coil (WC) inserts is experimentally studied under laminar flow conditions. The volume concentrations of the nanoparticles considered are 0.05, 0.2, and 0.5%. The study also investigates different values of the ratio of the pitch to diameter (p/di) of the WC inserts; those include 1.79, 2.54, and 3.24. Mass
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Heat Transfer in a Ferromagnetic Chemically Reactive Species J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-21 Hassan Tahir; Umair Khan; Anwarud Din; Yu-Ming Chu; Noor Muhammad
The impacts of Newtonian heating and a magnetic dipole in a two-dimensional ferrofluid due to a stretchable cylinder are analyzed in this paper. The effects of the homogeneous–heterogeneous reactions and a magnetic dipole are taken into account. Flow is caused by a linear stretching cylinder. Fourier’s law of heat conduction is applied in the evaluation of heat flux. Impacts of emerging parameters
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Experimental Validation of a Portable Power and Cooling System Using Integrated TEG-ORC J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-21 Hailei Wang; Terry Hendricks; Shankar Krishnan
A waste heat recovery system consisting of a hybrid power and cooling cycle is described in this paper. It couples a thermoelectric generator (TEG) and an organic Rankine cycle driving a vapor compression cycle to implement heat activated power and cooling. The system was designed, developed, and tested under laboratory conditions using a hot air source simulating a heavy-vehicle exhaust stream. The
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Finding Ablation Rates via Temperature Measurements from the Mars Science Laboratory J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-21 Robert L. McMasters; Robert Fricke; Grayson Larus; Mason Malone; Michael Hutwelker
The determination of the ablation rate for thermal protection systems on atmospheric entry is a difficult task, but can have significant implications in terms of safety and heat shield design. Ablation sensors of various kinds can be used to measure ablation directly, but in the event of a failure of these sensors, the use of thermocouples imbedded in the heat shield for determining the ablation rate
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Experimental Research on Flow and Heat Transfer in Microchannel with Refrigerant HFO1234yf J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-21 Ming Li; Yuan Luo; Yan Jiang; Wangrui Wei; Miao Wang
An experiment was carried out to study the effect of refrigerant mass flow rate, heat flux density, and saturation temperature on boiling heat transfer coefficient and frictional pressure drop in microchannel. Flow patterns are captured by a high-speed camera. HFO1234yf was used in rectangular microchannels with a hydraulic diameter of 0.5 mm. The results showed that there were eight flow patterns
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Graphite Ablation and Radiation on Interaction with Hypervelocity Earth-Entry Flows J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-21 Ranjith Ravichandran; Steven W. Lewis; Christopher M. James; Richard G. Morgan; Timothy J. McIntyre
The ablating species from the thermal protection systems upon atmospheric entry interact with the atomic/molecular gas species in the shock layer and form new products that affect total radiation. In this work, the ablation of carbon was experimentally studied by resistively preheating graphite strips to representative reentry wall temperatures and exposing them to hypervelocity Earth-entry flow conditions
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Global Sensitivity Analysis Based on BP Neural Network for Thermal Design Parameters J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-14 Yuting Yang; Liheng Chen; Yan Xiong; Shijun Li; Xu Meng
In order to obtain the thermal design parameters that have a great influence on the temperature T of the spectrometer frame, the sensitivity of the thermal design parameters of a balloon-borne spectrometer system was analyzed and calculated by the global sensitivity analysis (GSA) method based on the backpropagation neural network (BPNN) surrogate model. Firstly, the BPNN with 12 selected thermal design
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Influence of Supercritical Carbon Dioxide Condensation on Flow and Performance J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-14 Violetta Bushanova; Zheng Ping Zou; Maxim Ovchinnikov
The practical use of supercritical carbon dioxide (sCO2) for systems operating on the Brayton cycle is currently difficult due to the occurrence of nonequilibrium and uncontrolled states near the critical point. This paper provides an analytical overview of existing mathematical models and theories to predict the occurrence of a condensing state and its effect on compressor performance in conditions
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Efficient Calibration of a Turbine Disc Heat Transfer Model Under Uncertainty J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-08 Andrew White; Sankaran Mahadevan; Zachary Grey; Jason Schmucker; Alexander Karl
This paper presents a novel surrogate modeling approach that enables the application of Bayesian calibration to a gas turbine disc finite element (FE) heat transfer model. The surrogate modeling process begins with two transformations of the FE model predictions: first, principal components analysis “rotates” the multivariate FE model outputs into an uncorrelated and dimension-reduced subspace; second
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Natural Convection and Volumetric Radiation Interactions in a Concentric Square Annulus J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-01 Mohammed Bouanani; Abderrahmane Benbrik; Denis Lemonnier; Mohammed Cherifi; Rabiaa Soualmi
This paper focuses on a numerical investigation of steady two-dimensional natural convection and volumetric radiation interactions in a concentric annulus between two square isothermal cylinders. The annulus is filled with a gray absorbing–emitting and non-scattering medium. All the walls are assumed to be gray, diffuse, and opaque. The dynamic and thermal interactions are studied through a finite
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Effect of Insulations and Coatings on Hypersonic Heat Flux Reconstruction J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-12-01 Nhat M. Nguyen; Mathew L. Ruda; Luca Massa
The present study investigates the effects of material discontinuities and thermal resistances on the temperature reconstruction and heat flux evaluation via an inverse heat transfer method in hypersonic wind-tunnel tests. Thin coating layers and adhesive interfaces support a localized multidimensional temperature perturbation that alters the near-surface field. A technique is developed for the real-time
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Nonequilibrium Effects in Precursor Electrons Ahead of Shock Waves J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-11-16 Satoshi Nomura; Taito Kawakami; Kazuhisa Fujita
Precursor electrons ahead of the shock wave are measured with a Langmuir probe using the hypervelocity shock tube of the Japan Aerospace Exploration Agency. The current–voltage curve of the probe is obtained with rapid scanning of the applied voltage, and the distributions of electron number density and temperature are obtained. The experimental results are compared with the analytically calculated
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Evaluating Shock-Tube Informed Biases for Shock-Layer Radiative Heating Simulations J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-11-16 Christopher O. Johnston
A methodology for directly informing flight vehicle radiative heating simulations based on shock-tube measurements is developed. The differences between these shock-tube informed (STI) radiative heating values and the corresponding nominal values are typically the dominant contributor to the radiative heating margin. Previous approaches for evaluating the STI radiation were limited to the stagnation-point
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Permeability Calculation of a Fibrous Thermal Insulator Using the Lattice Boltzmann Method J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-11-11 Michel Ho; Sébastien Leclaire; Jean-Yves Trépanier; Marcelo Reggio; Alexandre Martin
Journal of Thermophysics and Heat Transfer, Ahead of Print.
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Natural Convection and Radiation in a Cavity with a Partially Heated Cylinder J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-11-11 Lahcen El Moutaouakil; Mohammed Boukendil; Zaki Zrikem; Abdelhalim Abdelbaki
The interaction effects of surface radiation with natural convection of a transparent medium in an asymmetrically cooled square cavity including a partially heated inner circular cylinder have been numerically simulated. In this context the finite volume method and the discrete ordinates method are incorporated to simulate radiation problems. The flow inside the cavity is driven by the heated part
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Simulations of a Sloshing Circular Cylinder Inside an Enclosure Filled with Nanofluids J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-11-11 Abdelraheem M. Aly; Zehba Raizah
This study applied an incompressible version of the smoothed particle hydrodynamics (SPH) method for simulating a sloshing circular cylinder during natural convection flow over a T-shaped fin in an enclosure occupied by Al2O3 nanofluid. The center area of the enclosure is saturated with a heterogeneous porous medium. Variations in the thermal conditions of the embedded circular cylinder and T-shaped
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Steady and Oscillating Characteristics of Natural Convection in an Enclosure J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-10-31 Nepal Chandra Roy
Natural convection in a rectangular enclosure that arises from multiple heat sources at the bottom wall is considered. The top wall is kept at the surrounding temperature while the vertical walls and the rest of the bottom wall excluding the heat sources are assumed to be adiabatic. Based on the above conditions, the mathematical model is formulated in terms of the dimensionless equations. Finite difference
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Impact of Sharp Versus Rounded Edge of Turbulator on Transport Enhancement J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-10-31 Lumaya Ahmed; Patrick Tran; Christopher Vergos; Erik Fernandez; Jayanta S. Kapat; Jose Rodriguez
Considering the constraints of manufacturing sharp ribs, a systematic study of the aerothermal behavior of the sharp and rounded-edge ribs has been performed. The investigation was conducted in a square channel with 45 deg ribs over a wide range of Reynolds numbers (Re=6000 to 135,000). The rounded-edge ribs are known to reduce heat transfer and friction compared to the sharp ribs. However, the studies
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Parametric Shape Optimization of Pin-Fin Arrays Using a Surrogate Model-Based Bayesian Method J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-10-28 Shinjan Ghosh; Sudeepta Mondal; Erik Fernandez; Jayanta S. Kapat; Asok Roy
Pin-fin arrays are generally present in trailing-edge regions of gas-turbine blades for internal cooling purposes. An elevated temperature is important to enhance the thermodynamic efficiency of gas-turbine cycles, and internal blade-cooling mechanisms are employed to mitigate material failure at these high temperatures. It is also important to have high heat transfer at a limited pressure drop to
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Turbine Blade Tip and Casing Phantom Cooling from Blade-Surface Film Coolant J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-10-22 Feng Li; Zhao Liu; Zhenping Feng
Numerical simulations are carried out to predict the phantom cooling on the blade tip and casing from blade-surface film coolant. The impacts of hole compound angles and shape for the pressure side (PS) film hole on the tip and casing phantom cooling are investigated under various mass flow ratios (MFR) of coolant to mainstream from 0.7% to 2.6%. The results indicate that the coolant derived from the
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Investigation of Heat Transfer to a Pulsating Flow in Plate Heat Exchangers J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-10-22 Fei Wang; Xiaobing Zhang; Junyun Yang
Journal of Thermophysics and Heat Transfer, Ahead of Print.
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Wall Heat Flux Evaluation in Regeneratively Cooled Rocket Thrust Chambers J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-10-01 Nikolaos Perakis; Lukas Preis; Oskar J. Haidn
In the present Paper, different wall heat flux evaluation methods for rocket engines are analyzed and compared. The test case for the comparison is a supercritical load point of an H2/O2 upper-stage engine. The evaluation of the heat flux using existing gradient methods shows unacceptable deviations, whereas significant improvements are found with an inverse heat transfer method. Using a Nusselt number
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Three-Dimensional Analysis of Transparent Flames by Light Field Deconvolution J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-10-01 Martin Eberhart; Stefan Loehle
Journal of Thermophysics and Heat Transfer, Ahead of Print.
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Enhancement of the Hydrothermal Characteristics of Fin-and-Tube Heat Exchangers by Vortex Generators J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-10-01 Djamel Sahel; Houari Ameur; Karima Alem
Geometrical configurations of tubes and vortex generators have been optimized in order to improve the hydrothermal characteristics of fin-and-tube heat exchangers. The work is divided into two parts: the first part concerns the effects of the inclination angle of the oval tube (α=0, 10, 20, 30, 40, 50, 60, 70, 80, and 90°); in the second part, the best case resulting from the first part is optimized
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Forward and Inverse Analyses of Two-Dimensional Eccentric Annular Fins for Space-Restriction Circumstances J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-10-01 Ranjan Das; Balaram Kundu
Heat transfer under space restriction is a challenging task in many energy systems due to unavoidable design constraints. For such conditions, the use of regular fin shapes cannot be possible, and eccentric geometry becomes a necessity. In this work, an optimization technique based on the inverse analysis using the differential evolution (DE) has been proposed to identify the dimensions of two-dimensional
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Solution of Maxwell’s Equations for Nonrectangular Electromagnetic Applications J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-09-19 Vishal Sharma; Klaus A. Hoffmann
The use of a fourth-order modified Runge–Kutta (MRK) scheme on a transformed coordinate system with Maxwell’s equations for nonrectangular domains and applications is presented. Maxwell’s equations are the governing equations for modeling electromagnetic wave propagation involving scattering, radiating structures, transmission lines, radar, biomedical applications, and nondestructive testing. Because
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Structural Response Modeling of a Woven Thermal Protection System J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-09-03 David Z. Dang; Eric C. Stern; Iain D. Boyd
Woven thermal protection systems (TPSs) are being developed for extreme heating conditions experienced during hypersonic atmospheric entry. A linear elasticity solver is used to model this new class of TPS. In particular, this paper explores and assesses the effectiveness of the linear elastic model for the Heatshield for Extreme Entry Environment Technology (HEEET) woven material through comparisons
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New Data Reduction Equation for Diamond Slug Calorimeter Heat Transfer Gauges J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-09-03 J. I. Frankel; Rowland T. Penty Geraets; M. McGilvray; Hongchu Chen
Journal of Thermophysics and Heat Transfer, Ahead of Print.
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Experimental Investigation of the Performance of Porous Insulation Materials Under Temporary Humidity J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-08-25 Korhan Ökten; Mustafa Özdemir
To decrease the heating and cooling demand of a building, thermal insulation is a well-known method. The properties of insulation materials are affected by many environmental factors, such as temperature and humidity. In this study, the change of thermal conductivity depending on relative humidity for a cold room was investigated experimentally. Furthermore, glass wool and rock wool were used as insulation
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Thermohydraulic Analysis on Helical Screw Insert at Different Strips with Nanofluid J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-06-11 Shashank Ranjan Chaurasia; R. M. Sarviya
The experimental analysis is conducted to evaluate the thermal hydraulic performance of nanofluid flow in a tube with a helical screw insert at a number of strips and different twist ratios in a transition flow regime. The Nusselt number is achieved the enhancement with nanofluid flow in the double-strip helical screw tape (DS-HST) as compared with the single-strip helical screw tape (SS-HST) insert
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Simulations of [math] Infrared Radiation Measurements in Shock and Expansion Tubes J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-06-11 Ulysse Dubuet; Satoshi Nomura; Shingo Matsuyama; Adrien Lemal; Hiroki Takayanagi; Kazuhisa Fujita
This Paper presents the simulations of CO2 and CO infrared radiation behind shock waves and in expansion flows. This work is motivated by the little amount of characterizations of CO2 infrared radiation in these expansion flows and thermodynamic regimes, whereas carbon dioxide infrared radiation is deemed to contribute significantly to the afterbody heating withstood by a Martian spacecraft. Japan
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Magnetohydrodynamic Mixed Convection and Entropy Analysis of Nanofluid in Gamma-Shaped Porous Cavity J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-06-25 Ali J. Chamkha; Mohamed Ahmed Mansour; Ahmed Mohamed Rashad; Hadi Kargarsharifabad; Taher Armaghani
The entropy generation due to magnetohydrodynamic mixed convection flow and heat transfer in a Gamma-shaped porous cavity is explored in this research by the finite volume technique. There exists an internal heating generation inside the cavity and the top and bottom walls are moving by constant velocities to induce forced convection. The cavity is filled with copper/water nanofluid and subjected to
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Enhanced Mixed Convection in a Vertical Channel by Addition of Staggered Inclined Baffles J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-07-13 Rabah Henniche; Abdelkader Korichi
In this Paper, two-dimensional unsteady laminar fluid flow and heat transfer characteristics have been investigated numerically in a symmetrically heated vertical channel with inclined baffles. The baffles are attached on both walls in a staggered manner with constant spacing. OpenFOAM®, an open source code based on the finite volume method, is used to solve the governing equations with the adequate
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Experimental Evaluation of the Long-Wave Infrared Transmittance of Hypersonic Flows J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-07-14 Adolfo Martucci
An experimental method is reported for the evaluation of the transmittance, in the 8–14 μm wavelength range, of the hypersonic flow of the SCIROCCO Plasma Wind Tunnel. The experimental setup for the measurements consists of a thermocamera and a black body placed on opposite sides of the facility, with hypersonic plasma in the middle of them. The situation is representative of the conditions at which
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Reduced-Order Computational-Fluid-Dynamics-Based Analysis of Aviation Heat Exchangers J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-07-14 Foluso Ladeinde
The goal envisioned for the Reduced-Order Computational Fluid Dynamics and Heat Transfer (ROM-CFDHT) procedure is obtaining fast turnaround in simulation time so that computational fluid dynamics can form a component of a system-level design tool. To accomplish this, a set of finite-element schemes is proposed, including the choice of the quadratic interpolation functions, the penalty approach, an
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Model for Rapidly Computing the Highest Temperature Based on Fermat Point in Chips J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-07-22 Dong-Liang Song; Gang Dong; Yi-Tong Yao; Yin-Tang Yang; Yang Wang
This paper proposes an analytical model for computing the highest temperature based on the Fermat point in chips. The transient temperature is determined through the heat source method based on the Fourier transform. Thermal accumulation at the Fermat point in chips of heat sources with identical powers is proposed based on the thermal path, and the expression of the highest temperature solved here
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Heater Position and Alumina Effects on Octadecane Melting in Sideways Cooled Cavities J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-07-22 Mouhcine Alouah; Abdelfattah El Mansouri; Abdelkhalek Amahmid; Mohammed Hasnaoui
In the present study, the enthalpy-based lattice Boltzmann method (LBM) with multidistribution function model is used to investigate the melting process engendered by a thin heater placed in the horizontal median plane of the cavity. The latter is cooled from its vertical walls by maintaining their temperature constant at TC, lower than the constant temperature TH of the heater (TC
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Analysis on Fluid-Induced Vibration and Heat Transfer of Helical Elastic Tube Bundles J. Thermophys. Heat Transf. (IF 1.307) Pub Date : 2020-08-03 Jiadong Ji; Runmiao Gao; Qinghua Chen; Weiqiang Chen; Jingwei Zhang
The study on fluid-induced vibration of helical elastic tube bundles (HETBs) to enhance heat transfer is of great significance in industrial production and energy utilization. The fluid-induced vibration response and the heat transfer property of a HETB heat exchanger were analyzed by using a two-way fluid–solid coupling method. The vibration frequency, displacement amplitude, and heat transfer coefficient