Boiling local heat transfer enhancement in minichannels using nanofluids

Ali Ahmad Chehade (1) , Hasna Louahlia Gualous (1) , Stéphane Le Masson (2) , Farouk Fardoun (3) , Anthony Besq (1)

1 LUSAC - Laboratoire Universitaire des Sciences Appliquées de Cherbourg
2 Orange Labs [Lannion]
3 LU / ULB - الجامعة اللبنانية [بيروت] = Lebanese University [Beirut] = Université libanaise [Beyrouth]

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.

Mots clés: Minichannels; Nanofluid; Convective boiling

Domaines: Sciences de l'ingénieur [physics]; Sciences de l'environnement; Physique [physics]; Matériaux; Milieux fluides et réactifs

Ali Ahmad Chehade, Hasna Louahlia Gualous, Stéphane Le Masson, Farouk Fardoun, Anthony Besq. Boiling local heat transfer enhancement in minichannels using nanofluids. Nanoscale Research Letters, 2013, 8 (1), pp.130. ⟨10.1186/1556-276x-8-130⟩. ⟨hal-02163946⟩