An experimental study on heat transfer of different aqueous surfactant solutions horizontal impinging jet using infrared thermography

Abstract

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 (Ra/Ro) and the ratio of heat transfer coefficient of water with additives (had) with the heat transfer coefficient for pure water (hpw).