Laminar Jet Cooling with Surfactant: A Novel Methodology to Enhance Quenching by Augmenting Stagnation and Parallel Zone Length

Abstract

The low flow rate laminar water jet is the most economical and efficient cooling methodology; however, the low heat removal capacity makes this process inappropriate for ultra-fast cooling operation. The significant heat transfer enhancement of low flow rate laminar jet cooling at very high initial surface temperature can mitigate the above mentioned requirement. But, the open literature does not reveal the exact technique for the attainment of significant augmentation of laminar water jet. Therefore, in the current work, the heat transfer rate has been tried to increase by enlarging the parallel zones and stagnation zone lengths which are achieved by the reduction in viscosity and surface tension of the coolant. The hydrodynamics study clearly indicates that the reduction in viscosity and surface tension of the coolant step up hydraulic jump and stagnation zone lengths and the heat transfer analysis reveals that the enhancement is achieved due to the alteration of the aforesaid properties. Among all the coolants, the maximum enhancement is achieved in case of CTAB added water jet depicting significant decrement in viscosity and surface tension among all the coolant. The maximum critical heat flux is achieved in case of 240ppm CTAB added water i.e. 1.81MW/m2 which is 1.35 times higher than pure water. The comparison illustrates that the experimental data have been well agreement with the results predicted by CFD models and also information reported by the previous researchers.