Experimental investigation into spray cooling heat transfer performance of Al2O3-water nanofluid with different subcooling degrees. (April 2022)

• Record Type: Journal Article
• Authors: Chang, Tong-Bou; Lin, Tsung-Han; Huang, Jhong-Wei
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 236:Number 2(2022)
• Page Start: 245
• Page End: 253
• Publication Date: 2022-04
• Subjects: Spray cooling -- nanofluid -- subcooling -- evaporation -- phase change; Mechanical engineering -- Periodicals; Production engineering -- Periodicals; Manufacturing processes -- Periodicals; 621.05
• DOI: 10.1177/09544089211037804
• Languages: English
• ISSNs: 0954-4089

Abstract

This study investigated the spray cooling heat transfer performance of Al2 O3 -water nanofluid given four different subcooling degrees (0 °C, 10 °C, 20 °C, and 30 °C). The results showed that the subcooled nanofluids were ranked in order of a reducing spray cooling heat transfer performance as follows: 20 °C, 10 °C, 0 °C, and 30 °C. On average, the heat transfer coefficient obtained using the nanofluid with 20 °C subcooling was around 8.3%, 8.6%, and 15.6% higher than that obtained with 10 °C, 0 °C, and 30 °C subcooling, respectively. However, the heat transfer performance decreased with an increasing spray operating time. The scanning electron microscopy observations showed that the reduction in the heat transfer coefficient was the result of a gradual increase in the thickness of the nano-adsorption layer on the heated surface as the spray operating time increased.