Faculty Publications
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Item A review of lattice boltzmann method computational domains for micro-and nanoregime applications(Begell House Inc., 2020) Narendran, G.; Arumuga Perumal, A.P.; Gnanasekaran, N.In the last two decades, microscale and nanoscale devices have received much interest due to the inevitable performance and their numerous applications not only in the field of fluid flow and heat transfer but also in bio-technology, bio-medical engineering, etc. In many situations, besides the conventional experiments and theoretical analysis, computations have emerged as a valuable tool for investigating the fluid transport and heat transfer phenomena. The lattice Boltzmann method (LBM) has emerged as an important option for micro-and nanoscale devices due to the fact that the LBM is well established for the range of Knudsen number. A comparative study on several working fluids used in the field of micro-and nanodevices such as microchannel, micro-cavity, microboiling, and nanochannel is categorized. Various aspects of nanofluids used in natural convection with different cavity configurations, flow boiling, immiscible fluids, liquid–vapor phase change are also critically reviewed. Different remarks and findings of available numerical results with several investigated parameters were summarized. © 2020 Begell House, Inc.Item Numerical Simulations of Fluid Flow and Heat Transfer through Aluminum and Copper Metal Foam Heat Exchanger–A Comparative Study(Taylor and Francis Ltd. michael.wagreich@univie.ac.at, 2020) Kotresha, B.; Gnanasekaran, N.This article discusses about a numerical simulation of a metal foam heat exchanger system carried out by a commercial software. A metal foam layer is attached to the bottom of the heat exchanger to absorb heat from the exhaust hot gas leaving the system. Two types of metal foams with two different pores per inch (PPI) values are considered for heat transfer enhancement. Similarly, two different materials Aluminum and copper, that poses high thermal conductivity, metal foams are considered for the present numerical simulations. The heat exchanger system is simulated over a range of 6–30 m/s fluid velocity. The proposed simulations are compared with theoretical and experimental data available in the literature. The goal is to improve the thermal performance of the heat exchanger by decreasing the pressure drop and maximizing the heat transfer rate. Finally, it has been noticed that the velocity of the fluid decreases as PPI increases at the expense of its pressure drop. The copper metal foam gives a maximum increase of 4–10% heat transfer rate compared to aluminum metal foams for a fluid velocity of 30 m/s. © 2019, © 2019 Taylor & Francis Group, LLC.