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Engineering Applications of Microscale Convective Heat Transfer
Published in C. B. Sobhan, G. P. Peterson, Microscale and Nanoscale Heat Transfer, 2008
An optimization study of a flat plate micro heat exchanger has been presented by Bau (1998), where the axial variation of the cross-sectional area has been optimized for minimum thermal resistance. The assumption here was a fully developed velocity profile for the incompressible fluid flow. Lee and Vafai (1999) have presented a comparison of the relative performance of jet impingement and microchannel cooling for high heat flux applications. A procedure for optimizing the channel geometry was discussed by them. It was observed that microchannel cooling was a preferable option for targets smaller than 7 × 7 cm while jet impingement was comparable or better than this method for larger dimensions of the target surface.
CFD study on heat transfer and pressure drop of nanofluids (SiO2/H2O, Al2O3/H2O, CNTs/H2O) in a concentric tube heat exchanger
Published in International Journal of Ambient Energy, 2022
Ankit Kumar Gupta, Bhupendra Gupta, Jyoti Bhalavi, Prashant Baredar, Hemant Parmar, Ramalingam Senthil
Day by day, the energy consumption increases, so the fulfilment of the energy demand of everyone around the world has become one of the biggest challenges. Researchers, scientist and engineers try their best to develop methods and devices which decrease the energy wastages and give optimum utilisation of available energy. Many devices are used in industries, power plants, refrigeration, air conditioning, automobiles, transportation and machining operation, with tremendous potential for energy conservation. One of those devices is the heat exchanger, so the importance of heat exchanger from the viewpoint of energy conservation increases immensely. A heat exchanger is a device that is used for heat transfer between hot fluids and cold fluids. There are several types of heat exchanger such as shell and tube heat exchanger, plate heat exchanger, helical coiled heat exchanger, radiator, double-pipe heat exchanger, micro heat exchanger, cooling tower and compact heat exchanger are presently used in various applications. Most of the heat exchangers are of the indirect contact type heat exchanger in which cold and hot fluid are separated from a wall and heat from hot fluids to cold fluids is transferred from the wall.