Multiple Air Jet Impingement Heat Transfer for Distinct Jet to Test Surface Spacing


Niranjan Murthy


Department of mechanical engineering, MS Ramaiah Institute of Technology, Bangalore, 560054, India

Corresponding Author Email: [email protected]

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Multiple Jet impingement is a recognized cooling technique practiced for high heat fluxes. Related to other conservative methods of single-phase heat transfer, multiple jet impingement gives better heat transfer co-efficient. In the earlier investigations more tests were steered to study and analyse the effect of numerous geometrical factors on the average heat transfer co-efficient. The present paper is an investigation on the heat transfer behaviour of multiple arrays of jets with air as a working fluid. The main objective of this work is to study the effectiveness of jet diameter and the heat transfer effects. A typical copper plate of size 20mmX20mm is used for the investigation. The length between the jet exit to test plate is varied from 10mm to 20mm.The circular air jets were used with a pitch of 3mm.Two types of jets were used with a jet diameter of 0.25mm and 0.5mm. The results showed that 0.25mm diameter jets are very effective with all the jet departure to test surface length examined. The Reynolds number has a substantial role in the heat transfer Characteristics.