Straatman, A.G - University of Western Ontario - Department of Mechanical and Materials Engineering

个人简介

Awards & Distinctions Edward G. Pleva Award for Excellence in University Teaching, 2007 Mohan Mather Award for Teaching Excellence in the Faculty of Engineering, 2001 Terry Base Award for Outstanding Teaching in Mechanical & Materials Engineering, 2001, 2002, 2003, 2006, 2007, 2008, 2011, 2014, 2015 USC Teaching Honour Roll, 2008, 2009, 2010

研究领域

Dr. Straatman's research is in the general area of thermofluids, and includes engineering modelling, computational fluid dynamics (CFD), and experiment and application. His research foci include: modeling the transport of heat, mass and species in porous materials; and research on rotating flows. Applications in porous media include: enhanced convective heat transfer, moisture transfer and evaporative cooling, while applications in rotating flows include compressed air motors, vortex tubes, and energy extraction devices. Dr. Straatman conducts fundamental research aimed at the development of models and algorithms that extend the capability for accurate simulation of fluid and heat flow. Of particular recent interest has been the development of accurate discretization techniques for conjugate heat/fluid flow modeling in fluid/porous/solid domains. Robust models have been developed to deal with transitions between fluid/porous regions and porous/solid regions. These interface formulations have extended the capability of our conjugate codes to deal with high Reynolds number flows with and without energy transfer and contact resistance. Research on porous metals for convective enhancement includes a combination of laboratory experiments, engineering modeling and CFD. Experiments have been conducted to characterize the permeability and void-level heat transfer of various graphitized carbon foams. Engineering models have been developed to describe the internal structure of the porous material and the hydrodynamic and thermal performance of porous graphitic foam devices. Continued effort is directed at modification of the foam structure to optimize the balance of hydrodynamic and thermal performance of the carbon foam, and at multiphase convective heat transfer. Recent effort has also been directed at the characterization of high-speed rotating flows, such as those seen in Ranque-Hilsch Vortex tubes (RHVT). A novel characterization of the Ranque-effect has been published in Physical Review letters, and has led to the development and patenting of a device that produces the cold output of a RHVT, but without the hot air output.

近期论文

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Khan, F., Straatman, A. G., “A conjugate fluid-porous approach to convective heat and mass transfer with application to produce drying,” J. Food Engineering, Accepted for publication, January 2016. DeGroot, C. T., Straatman, A. G., “A conjugate fluid-porous approach for simulating airflow in realistic geometric representations of the human respiratory system,” ASME J. Biomechanical Engineering, 138, 034501 1-7, 2016. Dyck, N., Straatman, A. G., “Radiative property characterization of spherical void phase graphitic foam with application to solar collection,” Int. J. Heat and Mass Transfer, 92, 1201-1204, 2016. Polihronov, J., Straatman, A. G., “The maximum COP of vortex tubes,” Canadian J. Physics, 99, 1-4, 2015. Polihronov, J., Straatman, A. G., “Vortex tube effect without walls,” Canadian J. Physics, 99, 1-6, 2015. Dyck, N., Straatman, A. G., “A new approach to digital generation of spherical void phase porous media microstructures,” Int. J. Heat and Mass Transfer, 81, 470-477, 2015. Khan, F., Fischer, C., Straatman, A. G., “Numerical modeling of heat and mass exchange in conjugate fluid/porous/solid domains with application to direct and indirect evaporative cooling,” Int. J. Heat and Mass Transfer, 80, 513-528, 2015. Polihronov, J., Straatman, A. G., “Angular propulsion – The rotational analog of rocket motion,” Canadian J. Physics, 99, 1-4, 2014. Farrokhnejad, M., Straatman, A. G., Wood, J. T., “Numerical simulation of solidification and prediction of mechanical properties in magnesium alloy casting,” Metalurgical and Materials Transactions B, 45B, 2357-2369, 2014. Farrokhnejad, M., Straatman, A. G., Wood, J. T., “A volume averaged finite-volume model for solidification of magnesium alloys on a general unstructured collocated grid,” Numerical Heat Transfer Part A, 65(8), 750-779, 2014. Betchen, L. J., Straatman, A. G., “A computational method for geometric optimization of enhanced heat transfer devices based upon entropy generation minimization,” Int. J. Numerical Methods in Fluids, 71(3), 370-402, 2013. Betchen, L. J., Straatman, A. G., “Entropy generation-based computational geometry optimization of the pore structure of high‑conductivity graphite foams for use in enhanced heat transfer devices,” Computers and Fluids, 103, 49-70, 2014, DOI: 10.1016/j.compfluid.2014.07.012. Polihronov, J., Straatman, A. G., “Thermodynamics of angular propulsion in fluids,” Physical Review Letters, 109, 054504, 2012. DeGroot, C. T., Straatman, A. G., “Numerical results for the effective flow and thermal properties of idealized graphitic foam,” ASME J. Heat Transfer, 134(4), Article 042603, 2012. DeGroot, C. T., Straatman, A. G., “A comparison of thermal dispersion behaviour in high-conductivity porous media of various pore geometries,” Defect and Diffusion Forum, Vols. 326-328, 307-312, 2012. DeGroot, C. T., Straatman, A. G., “Closure of non-equilibrium volume-averaged energy equations in high-conductivity porous media,” Int. J. Heat and Mass Transfer, 54(23-24), 5039-5048, 2011. DeGroot, C. T., Straatman, A. G., “A finite-Volume model for fluid flow and non-equilibrium heat transfer in conjugate fluid-porous domains using general unstructured grids,” Numerical Heat Transfer Part B, 60(4), 252-277, 2011. DeGroot, C. T., Gateman, D., Straatman, A. G., “The Effect of Thermal Contact Resistance at Porous-Solid Interfaces in Finned Metal Foam Heat Sinks,” ASME J. Electronic Packaging, 132(4), Article 041007, 2010. Betchen, L. J., Straatman, A. G., “An Investigation of the Effects of a Linear Porosity Distribution on Non‑Equilibrium Heat Transfer in High‑Conductivity Graphitic Foam,” Numerical Heat Transfer Part A, 58(8), 605-624, 2010. Cepek, J., Straatman, A. G., "Modelling of turbulent flow and heat transfer in graphitic foams," Diffusion and Defect Forum, Vols. 297-301, 739-744, 2010. Bahramian, F., Straatman, A. G., "A volume-based discrete test filter for conducting LES with application to physiological flow," Int. J. Numerical Methods in Fluids, DOI: 10.1002/fld.2158, 2009. Betchen, L. J., Straatman, A. G., "An accurate gradient and Hessian reconstruction method for cell-centered finite-volume discretizations on unstructured grids," Int. J. Numerical Methods in Fluids, 62(9), 945-962, 2009. Sultan, K., DeGroot, C., Straatman, A. G., Gallego, N. C., Hangan, H., "Thermal Characterization of porous graphitic foam - convection in impinging flow," Int. J. Heat and Mass Transfer, DOI: 10.1002/fld.2050, 2009. DeGroot, C., Straatman, A. G., Betchen, L. J., "Modelling Forced Convection in Finned Metal Foam Heat Sinks," ASME J. Electronic Packaging, 131(2), http://dx.doi.org/10.1115/1.3103934, 2009 Karimian, S. A. M., Straatman, A. G., "Numerical modeling of multi--directional flow and heat transfer in graphitic foams," ASME J. Heat Transfer, 131(5), http://dx.doi.org/10.1115/1.3084122, 2009.