Reconsider Prob. 3–130. Using EES (or other) software, investigate the effect of the center to center distance of the fins on the rate of heat transfer from the surface and the overall effectiveness of the fins. Let the center to center distance vary from 0.4 cm to 2.0 cm. Plot the rate of heat transfer and the overall effectiveness as a function of the center-to-center distance, and discuss the results.

Data from problem 130

A hot surface at 100°C is to be cooled by attaching 3-cm-long, 0.25-cm-diameter aluminum pin fins (k = 237 W/m · K) to it, with a center-to-center distance of 0.6 cm. The temperature of the surrounding medium is 30°C, and the heat transfer coefficient on the surfaces is 35 W/m² · K. Determine the rate of heat transfer from the surface for a 1-m × 1-m section of the plate. Also determine the overall effectiveness of the fins.

Transcribed Image Text:

POD -3 cm. 0.6 cm 0.25 cm