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Effect of Fins on Heat transfer

Brian Spencer Steven Besendorfer Winter 2010. Effect of Fins on Heat transfer. Model. D. T∞ = 23 °C h. L. Tb. Aluminum(k). Aluminum(k). t. Ts = 202.25 °C. Ts = 202.25 °C. T∞. T∞. 1/(h*A). 1/(h*At*No). Tb. Tb. t/(k*A). t/(k*A). Ts. Ts. Purpose:

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Effect of Fins on Heat transfer

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  1. Brian Spencer Steven Besendorfer Winter 2010 Effect of Fins on Heat transfer

  2. Model D T∞ = 23 °C h L Tb Aluminum(k) Aluminum(k) t Ts = 202.25 °C Ts = 202.25 °C T∞ T∞ 1/(h*A) 1/(h*At*No) Tb Tb t/(k*A) t/(k*A) Ts Ts

  3. Purpose: • Determine rate of heat transfer with and without fins • Determine fin effectiveness Purpose/methods Methods: • Place block on hot plate and measure base and surface temperatures using a thermocouple • Insert fins into block and re-measure the temperatures • Calculate rates of heat transfer and fin effectiveness as shown in the following slides

  4. Experimental Procedure Without Fins With Fins

  5. Calculations

  6. Calculations • Assumptions: • Steady-State • Free convection over a horizontal plate • Sides are well insulated • Effects of radiation are negligible • Ideal contact between fins and base as described in Table 3.1(b) • Properties of pin fins as described in Table 3.5

  7. q with fins = 23.72 W q without fins = 9.34 W Fin effectiveness = 2.54 • We originally wanted to calculate the difference in base temperature with and without fins; however, we learned that fins enhance heat transfer and do not directly influence the base temperature. • Based on this we changed our experiment to find the rates of heat transfer and fin effectiveness. • Our experiment showed that even with a minimal number of small fins the rate of heat transfer can be greatly enhanced; for our experiment, using fins of 1.5” length and 0.5” diameter more than doubled the heat transfer rate. Summary of Results/ Conclusions

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