Experimental and numerical research on the flow and heat transfer characteristics of TiO2-water nanofluids in a corrugated tube. (December 2017)

• Record Type: Journal Article
• Authors: Qi, Cong; Wan, Yong-Liang; Li, Chun-Yang; Han, Dong-Tai; Rao, Zhong-Hao
• Is Part Of: International journal of heat and mass transfer. Volume 115(2017)Part B
• Page Start: 1072
• Page End: 1084
• Publication Date: 2017-12
• Subjects: Nanofluids -- Enhanced heat transfer -- Forced convection -- Flow resistance -- Corrugated tube; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2017.08.098
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Resistance and heat transfer of nanofluids in a corrugated tube are studied. Effects of Peclet number and Reynolds number on heat transfer are investigated. Comprehensive performance of resistance and heat transfer enhancement is evaluated. Abstract: Flow resistance and enhanced heat transfer characteristics of TiO2 -water nanofluids in a stainless-steel corrugated tube and a circular tube are investigated by experimental and numerical methods respectively. The flow and heat transfer characteristics of TiO2 -water nanofluids and deionized water in test tubes are compared in this paper. In addition, effects of Reynolds number ( Re ) and nanoparticle mass fraction ( ω ) on flow and heat transfer performances are discussed respectively, and Nusselt number ( Nu ) and resistance coefficient ( f ) are studied respectively. Finally, comprehensive performance of flow resistance and heat transfer enhancement is evaluated. It can be obtained that adding nanoparticle into deionized water doesn't cause a large additional resistance loss in some degree, while the combination of corrugated tube and TiO2 -water nanofluids shows an excellent heat transfer enhancement, which can enhance the heat transfer by 53.95% at maximum extent. In addition, the corrugated tube has a strong sustainability in enhancing heat transfer. The enhanced heat transfer rising part (6000 ≤ Re ≤ 10, 000) has a large rising slope (about 7.90E−5), and the descending slope (about 7.16E−6) of enhanced heat transfer part (10, 000 ≤ Re ≤ 12, 000) is small.