An Experimental Study on the Simultaneous Effect of Nanofluid and Tube Insert on the Thermal Performance of an Automobile Cooling System

In this research, an experimental study is conducted to investigate the effect of simultaneous use of tube insert and nanofluid on the thermal performance of the automotive cooling system (radiator). Al۲O۳-water based nanofluid is used and the flow regime is laminar (Reynolds ۱۰۰۰-۱۸۰۰). For this study, an experimental automotive cooling system is designed and built. Thermal performance of Al۲O۳-water nanofluid at three concentrations of ۰.۱, ۰.۲ and ۰.۴% weight fraction of Al۲O۳-water nanofluid compared to water is monitored by variations of flow rate. In this research, a tube insert with a steel wire rod and a sine profile inside the radiator tube is used as a turbulent-maker. The results show that the sole use of nanofluid, without a tube insert inside the radiator, increases the heat transfer coefficient by about ۱۱%, and the use of a tube insert together with distilled water increases heat transfer coefficient by about ۳۵%. Finally, the use of tube insert together with Al۲O۳-water based nanofluid at their best mass concentration increases heat transfer coefficient by about ۵۶%.

Keywords:

Nanofluid , Tube Insert , Cooling , Al۲O۳