Convective heat transfer under different jet impingement conditions – optimum design to spray parameters
Abstract
Purpose
This paper aims to improve the cooling performance of the impinging jet to the machining and power transmissions, and provides more parameters to the design of the cooling system.
Design/methodology/approach
A multiphase flow model with heat transfer terms is established to calculate the convective heat transfer coefficient. The computational fluid dynamics method is used to simulate the jet flow. The convective heat transfer coefficients with different spray parameters are calculated and their variations are obtained. Temperatures are tested to reflect the cooling performance (convective heat transfer coefficients) with different spray parameters.
Findings
The results show that the higher convective heat transfer coefficient can be obtained with the same flow rate by decreasing nozzle diameter while increasing either the number of nozzles or the oil supply pressure. The spray distance was found to have little influence on convective heat transfer; however, the more the spray is directed parallel to the surface, the higher the convective heat transfer coefficient. The computational results coincide well with the experimental results.
Originality/value
The research presented here leads to a design reference guideline that could be used in machining and power transmissions to reduce the temperature, thus improving their quality and efficiency, and preventing failure at high speeds and/or under heavy loads.
Keywords
Acknowledgements
This research was supported by grants from the National Natural Science Foundation of China (grant number: 51275020) and the National Science and Technology Support Program of China (grant number: 2014BAF08B01).
Citation
Wang, Y., Niu, W., Wei, S. and Song, G. (2016), "Convective heat transfer under different jet impingement conditions – optimum design to spray parameters", Industrial Lubrication and Tribology, Vol. 68 No. 2, pp. 242-249. https://doi.org/10.1108/ILT-07-2015-0100
Publisher
:Emerald Group Publishing Limited
Copyright © 2016, Emerald Group Publishing Limited