Nanofluids spray heat transfer enhancement. (March 2016)

• Record Type: Journal Article
• Authors: Hsieh, Shou-Shing; Liu, Hao-Hsiang; Yeh, Yi-Fan
• Is Part Of: International journal of heat and mass transfer. Volume 94(2016:Mar.)
• Page Start: 104
• Page End: 118
• Publication Date: 2016-03
• Subjects: Nanofluids -- Spray cooling -- Volume fraction -- Transient cooling curve -- Boiling; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2015.11.061
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: The boiling characteristics of ONB, CHF, as well as LFT are discussed. The correlation was first made possible for surface tension data. Al2 O3 are at the best heat transfer rate at the volume fraction of 0.1 vol%. Abstract: Spray cooling experiments were carried out to study the effect of seven (7) different types of nanofluids on heat transfer enhancement. Three different concentrations of 0.04%, 0.07%, and 0.1% by volume of Ag, Al, Al2 O3, Fe3 O4, SiO2, TiO2 and multi-walled carbon nanotubes (MWCNTs) dispersed with deionized (DI) water were tested, and transient as well as steady spray boiling experiments were conducted over a copper flat plate heater 4 cm 2 in size with a 1 cm thickness. The spray was issued by a 270 μm full-cone nozzle with a spray height of 30 mm and a spray mass flux of 1.5 × 10 −3 kg/cm 2 s. Both a transient cooling curve and steady boiling curve were obtained. The results revealed that the average heat transfer coefficient (HTC), as well as the associated critical heat flux (CHF), are significantly enhanced, and the enhancement ratio can be up to 1.7 (HTC) and 1.84 (CHF), respectively, corresponding to the DI water as the nanofluids' volume fraction increased from 0.04% to 0.1%.