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EXPERIMENTAL STUDY OF HEAT TRANSFER INTENSIFICATION USING MICROJETS

DOI: 10.1615/ICHMT.2009.CONV.410
10 pages

Dariusz Mikielewicz
Gdansk University of Technology, Faculty of Mechanical Engineering, 80-233 Gdansk, ul. Narutowicza 11/12, Poland

Tomasz Muszynski
Gdansk University of Technology, Faculty of Mechanical Engineering, Heat Technology Department, ul. Narutowicza 11/12, 80-952 Gdansk, Poland

Résumé

The experimental research of heat transfer enhancement due to impingement of a single microjet of water is studied. A correlation for heat transfer coefficient has been derived, which later was used in validation of a model of a single microjet developed earlier, Mikielewicz (2007). Two microjet nozzle diameters were studied, i.e. 160 and 260 μm. The results in the form of empirical value of heat transfer coefficient have been substituted to a simple analytical model of microjet. Such analytical model of microjet is of a great value when the sensitivity tests are to be carried out. The model is quite general and its further modifications are possible when some of the assumptions are relaxed. More experiments on the structure of a single microjet are needed which will confirm the correlation presented in the paper.

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