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ISSN Online: 2688-7231

ISBN Online: 978-1-56700-524-0

Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
December, 17-20, 2021, IIT Madras, Chennai, India

Heat transfer enhancement using multi jet impingement with and without rotation

Get access (open in a dialog) DOI: 10.1615/IHMTC-2021.200
pages 133-139

要約

Jet impingement cooling has been found to be extremely useful for heat removal, especially in localized high heat flux applications. Recent research indicates that multi jet impingement systems deliver better heat transfer performance over conventional single jet systems. In this work, we investigate the thermal characteristics of a hot plate, impinged upon by multiple orthogonal air jets, emanating from nozzles, mounted on a rotating disk. The Aluminum hot plate used, has dimensions 130 × 130 × 5mm. Three nozzles, each of diameter 3mm, are positioned on the disk at an angle of 120°, such that the inter-jet spacing is 50mm. The disk is rotated at speeds ranging from 0 to 300 rpm, to understand the effect of rotation on the heat removal rate. The effect of normalized jet to plate distance (z/d), jet Reynolds number (Re), and the rotational Reynolds number (Reω) on the heat removal rate from the plate is investigated. The jet to plate distance is found to have appreciable influence on the heat removal rate, with the maximum heat transfer occurring at an optimum value of z/d. Larger the jet Reynolds number, the better is the heat transfer performance. Most importantly, it is observed that, the rotation of the disc, enhances the heat removal rate considerably, which may be due to the swirling motion of air and the turbulence generated, as a result of rotation. The results of this study show that rotating multi-jet impingement offers significant promise as a heat transfer enhancement technique in high heat flux applications.