Nanofluid nucleate boiling assessment on heating surfaces: a comprehensive study

In this investigation, an experimental study was conducted using different nanofluids to analyze nucleate pool boiling at saturated conditions. An experimental setup was developed to investigate the effect of heating surface characteristics and nanofluids on the heat transfer coefficient. Pool boiling tests were performed using deionized water as well as the Fe2O3-water and Al2O3-water nanofluids. Two copper heating surfaces, smooth and rough, were used in this investigation. By examining experimental data and surface characteristics before and after pool boiling, researchers investigated the effect of surface/nanofluid interaction and the impact of nanoparticle deposition on the heating surface. The present work investigates the impact of surface roughness and nanoparticle deposition on heat transfer during nucleate pool boiling using different nanofluids. The experimental data and surface characteristics before and after boiling were examined to evaluate the effect of surface/nanofluid interaction on heat transfer. This investigation examined how surface roughness and nanoparticle deposition impact heat transfer during boiling. It is found that the rough surface increased HTC by 48% compared to the smooth surface. Al2O3-water and Fe2O3-water nanofluids increased HTC by 52% and 62%, respectively, for low-concentration nanofluids on the smooth surface. The alumina nanofluid had a slight increase of 15% in HTC up to 400 W(m(2)K)(-1), while the maghemite nanofluid had an HTC lower than water. For the rough surface and low-concentration nanofluids tested, HTC increased by 21% for alumina and 9% for maghemite up to 300 W(m(2)K)(-1), followed by a decrease for higher heat fluxes. It is concluded that rough surfaces with active nucleation sites have a significant impact on HTC during boiling. Images showed that the rough surface had more steam bubbles compared to the smooth surface, indicating more active nucleation sites.

Automated summary

In this study, different nanofluids were used to investigate nucleate pool boiling at saturated conditions. The effect of heating surface characteristics and nanofluids on the heat transfer coefficient was studied using an experimental setup. Results showed that the rough surface and nanofluids significantly increased the heat transfer coefficient during boiling.