Forced Convective and Nucleate Flow Boiling Heat Transfer to Alumnia Nanofluids

Mohammad Mohsen Sarafraz,Faramarz Hormozi

doi:10.3311/ppch.2206

Abstract

A large number of experiments have been performed to quantify the forced convective and nucleate flow boiling heat transfer coefficient of Al 2 O 3 water based nanofluid. The employed test loop provides conditions to investigate the influence of operating parameters such as heat flux, flow mass flux and volumetric concentration of nanofluids (0.5, 1 and 1.5%). Results demonstrate that two heat transfer regions are observed namely forced convective and nucleate boiling region. Investigating on the operating parameters illustrated that with increasing the heat flux and flow rate of nanofluid, heat transfer coefficient of nanofluid dramatically increases. In contrast, with increasing the volumetric concentration of nanofluid, controversial condition is observed such that increases the heat transfer coefficient in forced convective region is reported while reduction of heat transfer coefficient is seen for nucleate boiling zone. Obtained results were then compared to Chen and also Gungor-Winterton well-known correlations. Results of this comparison show that experimental data are in a good agreement with those of obtained by correlations.

Highlights

Fluid heating and cooling play important roles in many industries including nuclear power plants, power cycles, power stations, production processes, transportation and electronics
Following literature briefly represents some recent works conducted on forced convective and flow boiling heat transfer of nanofluid
5 Conclusions Experimental investigation on flow boiling heat transfer coefficient of dilute Al2O3 water based nanofluid was conducted and following conclusions were made: ● According to experimental data, two distinguishable heat transfer regions are observed including the forced convective and nucleate boiling heat transfer regions. ● Heat flux and mass flux have a strong influence on heat transfer coefficient in both of heat transfer regions

Summary

Introduction

Fluid heating and cooling play important roles in many industries including nuclear power plants, power cycles, power stations, production processes, transportation and electronics. Following literature briefly represents some recent works conducted on forced convective and flow boiling heat transfer of nanofluid.

Results

Conclusion