A review on multiple liquid jet impingement onto flat plate

Abstract

Multiple jet impingement has been an important industrial application for a long time. Processes like quenching of hot steel surfaces in steel industry utilize the high heat-carrying capacity of liquid multiple impinging jets in order to achieve the uniform temperature of the metallic surface. The objective of this paper is to summarise the state of the art of the process of multiple jet impingement onto flat plate and highlight the future scope of research space in this field. This study focuses on the arrays of impinging liquid jets and to summarize relevant experimental and numerical results on multiple liquid jet impingement heat transfer and hydrodynamic behavior together with the latest developments published in the literature. The present work is limited to the normal impingement of multiple liquid jets on flat surfaces and the physics behind the single and multiple liquid jet configurations are discussed in the paper followed by the experimental studies. The effect of various paprameters like the jet diameter, jet velocity, velocity-profile, jet to target distances, jet to jet distances, and surface boundary conditions. The numerical studies discuss the studies conducted on multiple jet impingement and compare the accuracy of the different numerical methods utilized in the studies. The extrapolation of the results obtained from single liquid jet impingement have been discussed to suggest efficient methodologies for multiple jet impingement studies. It has been found that the study of hydrodynamic characteristics of multiple jet impingement is an important aspect that affects the heat transfer rate due to the jet impingement and needs to be explored further to find a better correlation between heat transfer rate and different hydrodynamic parameters of the flow.