EFFECT OF ROTATING CONDITION ON HEAT TRANSFER CHARACTERISTICS OF IMPINGING JET ARRAY IN FLOW CHANNEL
Main Article Content
Abstract
In this paper, heat transfer characteristics in the flow channel under stationary and rotating conditions were studied. The array of jets from 3 x 11 of orifice holes with diameter Dj = 5 mm with the inline arrangement was studied at pitch distance S/Dj = 4 and the impingement distance L/Dj = 2, 4 and 6. The jet flow was fixed with a Reynolds number of 10,000 and the rotation speed of the flow channel was varied between Ro = 0.0 - 0.0066 (or the speed of 400 rpm). The heat transfer was measured on the impingement surface using a Thermochromic Liquid Crystal (TLC) sheet to measure the temperature and calculate the convective heat transfer coefficient. Results showed that the rotational condition affected the heat transfer characteristics due to the effects of Centrifugal and Coriolis forces on the jet flow and cross flow. This caused the Nusselt number on the surface to be increase by 6.43 % for the case of leading side compared to that of the case of trailing side.
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright @2021 Engineering Transactions
Faculty of Engineering and Technology
Mahanakorn University of Technology
References
Siddique,W., Khan, N.A. and Haq, I., “Analysis of numerical results for two-pass trapezoidal channel with different cooling configurations of trailing edge: the effect of dimples,” Applied Thermal Engineering, Vol. 89, pp.763–771, 2015.
Chen, Y., Chew,Y.T. and Khoo, B.C., “Heat transfer and flow structure in turbulent channel flow over protrusions,” International Journal of Heat and Mass Transfer, Vol. 66, pp. 177–191, 2013.
Wang, C., Liu, Z.L., Zhang, G.M. and Zhang, M., “Experimental investigations of flat plate heat pipes with interlaced narrow grooves or channels as capillary structure,” Experimental Thermal and Fluid Science, Vol. 48, pp. 222–229, 2013.
Han, J.C. and Chen, H.C., “Turbine blade internal cooling passages with rib turbulators,” Journal of Propulsion and Power, Vol. 22, pp. 226–248, 2006.
Kaewchoothong, N., Maliwan, K., Takeishi, K. and Nuntadusit, C., “Effect of rotation number on flow and heat transfer characteristics in serpentine passage with ribbed walls,” Journal of Mechanical Science and Technology, Vol. 32, pp. 4461–4471, 2018.
Lamont, J.A., Ekkad, S.V. and Alvin, M.A., “Effects of rotation on heat transfer for a single row jet impingement array with crossflow”, Journal of Heat Transfer, Vol. 134, pp. 082202, 2012.
Elston, C.M. and Wright, L.M., “Leading edge jet impingement under high rotation numbers”, Journal of Thermal Science and Engineering Applications, Vol. 120, pp. 368-375, 2015.
Florschuetz, L.W., Truman, C.R. and Metzger, D.E., “Streamwise flow and heat transfer distributions for jet array impingement with crossflow”, ASME Journal of Heat Transfer, Vol. 103, pp. 337-342, 1981.
Katti, V. and Prabhu, S.V., “Influence of spanwise pitch on local heat transfer distribution for in-line arrays of circular jets with spent air flow in two opposite directions,” Experimental Thermal and Fluid Science, Vol. 33(1), pp. 84-95, 2008.
Hoberg, T.B., Onstad, A.J. and Eaton, J.K., “Heat transfer measurements for jet impingement arrays with local extraction,” International Journal of Heat and Fluid Flow, Vol. 31, pp. 406-467, 2010.