Boiling local heat transfer enhancement in minichannels using nanofluids
1 Université de Caen Basse Normandie, LUSAC, 120 rue de l’exode, Saint Lo, 50000, France
2 France Telecom, Orange Labs, 2 av Pierre Marzin, 22/300, Lannion, France
3 Department of Industrial Engineering and Maintenance, Lebanese University, Saida, 1600, Lebanon
Nanoscale Research Letters 2013, 8:130 doi:10.1186/1556-276X-8-130Published: 18 March 2013
This paper reports an experimental study on nanofluid convective boiling heat transfer in parallel rectangular minichannels of 800 μm hydraulic diameter. Experiments are conducted with pure water and silver nanoparticles suspended in water base fluid. Two small volume fractions of silver nanoparticles suspended in water are tested: 0.000237% and 0.000475%. The experimental results show that the local heat transfer coefficient, local heat flux, and local wall temperature are affected by silver nanoparticle concentration in water base fluid. In addition, different correlations established for boiling flow heat transfer in minichannels or macrochannels are evaluated. It is found that the correlation of Kandlikar and Balasubramanian is the closest to the water boiling heat transfer results. The boiling local heat transfer enhancement by adding silver nanoparticles in base fluid is not uniform along the channel flow. Better performances and highest effect of nanoparticle concentration on the heat transfer are obtained at the minichannels entrance.