Numerical investigation on heat transfer and pressure drop in heat exchanger using hybrid nanofluids
Compact heat exchangers or as a short form call it CHE, which have a lot of surface with big area and it can lead to higher efficiency compared to conventional heat exchangers. They are usually used in thermal fluid systems in various applications such as automotive thermal fluid systems, because in...
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2023
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| Summary: | Compact heat exchangers or as a short form call it CHE, which have a lot of surface with big area and it can lead to higher efficiency compared to conventional heat exchangers. They are usually used in thermal fluid systems in various applications such as automotive thermal fluid systems, because in automotive there will be such as radiators and it functioned for cooling systems for engines. Current technology research introduces a new heat transfer coolant called "nanofluids". This type of nanofluids exhibits greater and high thermal properties compared to normal fluid or conventional coolants because of the presence of suspended nano sized composite particles in a base fluid. By using numerically analysis, there will be different types of nanoparticles in water-base fluid, namely Aluminium Oxide (Al2O3), Titanium Dioxide (TiO3), and Silicon Dioxide (SiO2) on automotive flat-tube cross-flow plate-fin CHE, is discussed in this study. In this study, there will be considered of 2% volume fraction of nanoparticles for all nanofluid types. The tri-dimensional (3D) equations governing both liquid flow and heat transfer are settled using a standard method of finite volume (FVM) for the Reynolds number range between 4000 and 7000. The standard κ-ε turbulence model with wall function is included in this study. The computational model is used to study variations in the shear stress, skin friction, and the coefficient of convective heat transfer. All parameters are found to yield higher magnitudes along the flat tubes with the nanofluid flow than the base fluid in developing regions. For nanofluids the pressure drop is slightly larger but insignificant at the tube's outlet region. |
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