Lab 5 - Experimental Results

Lab 5 - Experimental Results - Experimental Results The...

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Experimental Results The intent of this lab was to create a hot dog anemometer to determine the air velocity through the wind tunnel. In this experiment the hot dog was simulated by a plastic cylinder since the properties of plastic are more readily defined. Transient heat transfer and external force convection concepts were used to perform the respective analysis and calculations. In this experiment there is a temperature difference between the plastic cylinder which is in contact with the surrounding air resulting in a heat transfer interaction corresponding to a temperature profile as shown in figure 1. Cylinder Temperature Distribution 0 10 20 30 40 50 60 70 80 90 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 Time (s) Temperature (C) Air temp Cylinder temp Figure 1. Temperature profile at center of cylinder during a period of 600 seconds. In this experiment the hot plastic cylinder was submerge in to a cooler cross flow of air in the wind tunnel. The air temperature was kept constant, but the center temperature of the cylinder varied as time elapsed. From figure 1 or from equation x , the dimensionless temperature θ o can be calculated over a time period of 600 seconds.
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To determine the velocity of the air it was necessary to determine all of the following dimensionless parameters summarized in Table A.
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This note was uploaded on 09/08/2010 for the course ME 115 at San Jose State University .

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Lab 5 - Experimental Results - Experimental Results The...

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