- Journal of Thermal Engineering
- Vol: 7 Issue: Supp 14
- Numerical investigation of effect of different parameter on heat transfer for a crossflow heat excha...
Numerical investigation of effect of different parameter on heat transfer for a crossflow heat exchanger by using nanofluids
Authors : Mustafa Kilic, Atta Ullah
Pages : 1980-1989
Doi:10.18186/thermal.1051287
View : 14 | Download : 10
Publication Date : 2021-12-30
Article Type : Research
Abstract :The heat loads on electronic systems of an unmanned air vehicle are a significant problem. So enhancing heat transfer is a critical key to solve these thermal problems. This study is focused on increasing heat transfer rate in a crossflow heat exchanger by using nanofluids numerically. Effects of different Reynolds number of hot fluid (Re= 6000, 8000, 10000, 12000), different inlet velocity (Vair,inlet=30, 45, 60, 90 m/s) of cooling fluid, temperature of cooling air at different altitude (Tair,inlet=15, 10, 4, -17℃) and different types of nanofluids (Cu-H2O, CuO-H2O, TiO2-H2O, H2O) on heat transfer were studied numerically. Realizable k-ε turbulence model of ANSYS FLUENT computational fluid dynamics code was used for numerical analysis. It was obtained that increasing Reynolds number from Re=6000 to 12000 causes an increase of 44.65% on average Nusselt Number. Increasing inlet velocity of cooling air from 30 m/s to 90 m/s causes an increase of 6.96% on average Nusselt number. Increasing or decreasing air inlet temperature at different attitude does not cause any significant change on average Nusselt number. Using Cu-H2O nanofluid, which shows the best performance, causes an increase of 6.63% on average Nusselt number according H2O. Numerical results were also compared with experimental results at literature. It was obtained that numerical model can represent experimental results in a good level.Keywords : Computational Fluid Dynamics, Heat exchanger, Nanofluid, Unmanned Air Vehicles