RT Journal Article ID 66284a820d6a7a6f A1 Lau, S. C. A1 Russell, L. M. A1 Thurman, D. R. A1 Hippensteele, S. A. T1 VISUALIZATION OF LOCAL HEAT TRANSFER IN A PIN FIN CHANNEL WITH LIQUID CRYSTALS JF Journal of Flow Visualization and Image Processing JO JFV YR 1995 FD 1995-09-01 VO 2 IS 3 SP 267 OP 283 AB Thermochromic liquid crystals and an Inconel foil heater were used to map the detailed local heat transfer distributions in a rectangular pin fin channel with ejection holes along one side wall and the end wall. The staggered array of pins had 12 alternate rows of three and two pins. The pin height-to-diameter ratio was 1.0 and the spacings between two adjacent pins was 2.5 times the pin diameter. Results were obtained for Reynolds numbers based on the pin diameter and maximum velocity in the pin fin channel of approximately 25,000, 40,000, 60,000, and 90,000. The local heat transfer coefficient was generally low in the first row, high in the third and fourth rows, and decreased downstream of the fifth row of pin fins along the channel, as air exited through the ejection holes. The local heat transfer coefficient was very high at the bases of the pins, relatively high near the ejection holes, and was the lowest near the corner between the side wall with the ejection holes and the end wall. The heat transfer coefficient distributions with and without end wall flow ejection differed very little over the upstream half of the channel. Near the end wall, however, the heat transfer distributions were very different, with lower values but slightly larger variations in the case of no end wall flow ejection. Under the conditions of the present investigation, the relative local Nusselt number distribution appeared to be independent of the flow Reynolds number. PB Begell House LK https://www.dl.begellhouse.com/journals/52b74bd3689ab10b,7be3b4141640d62a,66284a820d6a7a6f.html