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Calculation details: Free convection Calculations: Gr = g(T-T_) Ra = Gr.Pr= NuL = 0.68+ P.L 0.67 Ra 0.492 Pr 9/16 h L Nu k
Calculation details: Free convection Calculations: Gr = g(T-T_) Ra = Gr.Pr= NuL = 0.68+ P.L 0.67 Ra 0.492 Pr 9/16 h L Nu k Nu P.L k L I predicted = h-A.AT a' lation details: Forced Convection Calculations: u L R, = V Nu=0.664 Re.Pr3 p.L h L Nuk Nu P.L k =>h= L 1. To estimate the heat loss from module back surfaces at each power setting, first calculate q'loss =qset-predicted based on free convection results. Here, qset is the power setting, and predicted is calculated from a semi-empirical correlation based on measured temperatures. Then, for each forced convection measurement, estimate the heat loss as gloss = (g'loss/AT')AT, where AT=T, -To (take T4 as Tx, see p. 10; discuss why) and AT" is the value under free convection. The actual heat transfer to the air flow after calibration is, therefore, given as calibrated set - gloss. [Note: and AT" are free convection data.] This experiment is intended for analyzing free and forced convections for external flow over a vertical plate. Discuss how the setup can be improved to better simulate the external flow. Prelab Assignment (due before the class) Below is the data for qset = 35 W. For the prelab assignment, perform a complete data analysis following the steps in Lab2_Convection_Calculation Procedure.pdf. uco (m/s) Too (F) 0.0 (free) 0.6 1.0 1.3 81 78 77 76 T, (F) 298 271 246 221
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