Number：

01100008

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Name：

曾憲中

Titles：

Professor

Author：

T.M Jeng , S.C Tzeng , C.Y. Wu , and C.T. Yeh

Paper name：

Experimental Study of Heat Transfer Coefficients on the Plate with Confined Impinging Jet Array

Name of activity：

Advanced Science Letters

Keywords：Impinging Jet Array, Transient Liquid Crystal Method, Heat Transfer

Abstract：This work investigated the local and mean heat transfer characteristics of the palte under the confinded impinging jet array. The transient liquid crystal method was employed to obtain the detailed measurements of heat transfer coefficients. Vartable parameters were the ratio of the impinging distance to the jet nozzle’s diameter (Hid), the ratio of axial lengths of the oval jet nozzle (AR), the mode of the exit flow orientation and the jet Reynolds number. Experimental results indicated that the peak values of Nu of the circular-jet-nozzle systems (AR=1) were higher than those of oval-jet-nozzle systems (AR=0.5 and 2). Addltionally, the peak values of Nu reduced much more at the more downstream regions, especially for the single-exit flow orientation modes (Mode I and III) or the oval-jet-nozzle systems. Increasing Hid would decrease Nu significantly. Furthermore, the Nu of circular-jet-nozzle systems (AR = 1) were generally higher than those of oval-jet-nozzle systems (AR = 0.5 and 2). The systems of AR = 0.5 and 1 had the similar sensitivity of Re to Nu. The system of AR = 2 had the worst sensitivity or Re to Nu. Finally, based on all data, this work provided the empirical relationships between the Nu and Re.

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