Journal
APPLIED THERMAL ENGINEERING
Volume 188, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2021.116668
Keywords
Jet impingement; Thermal imaging technique; Heat transfer coefficient; Aqueous surfactant solutions
Funding
- Ministry of Human Resource Development (MHRD), India
- KOREA HYDRO & NUCLEAR POWER CO., LTD [2018-RFP-Safety-5]
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This study investigates the effect of surface wettability on heat transfer characteristics of impinging jets using infrared thermography. The results demonstrate that enhanced wettability can significantly improve heat transfer efficiency.
This paper reports the effect of surface wettability on heat transfer characterizes of the impinging jet using the infrared thermography. Tests are performed on a heated vertical stainless steel foil of 0.15 mm thickness (SS-304) by circular horizontal impinging jets of pure water and various aqueous surfactant solutions such as 2-Ethyl Hexanol (2-EH), 1-Octanol (1-Oct) and Sodium-Dodecyl Sulfate (SDS) at varied surfactant concentration (100-400 ppm). The effect of wettability enhancement in heat transfer is disclosed by the heat transfer study using the thermal image detected by the infrared thermography system (A655sc, FLIR System). At a similar time period (t = 0.2 sec) after impingement, the liquid spreading is found to grow by a maximum of 3.1 times for 2-EH and 2.4 times for SDS. New empirical correlations are presented using regression analysis for the enhancement of radial impingement zone (R-a/R-o) and the ratio of heat transfer coefficient of water with additives (h(ad)) with the heat transfer coefficient for pure water (h(pw)).
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