(A+)열유체설계및실험_열전달_결과레포트

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"(A+)열유체설계및실험_열전달_결과레포트"에 대한 내용입니다.

목차

Ⅰ. Result
1. Newton`s cooling law.
2. Hilpert correlation
3. Churchill and Bernstein correlation

Ⅱ. Discussion
1. Film temperature & Linear interpolation
2. Other heat transfer
3. Ignoring the height
4. Assumption of steady state
5. Power reduction

Ⅲ. Conclusion

Ⅳ. Reference

Ⅴ. Appendices

본문내용

1. Newton`s cooling law.
h=Q ̇/(A×(T_heat-T_air ) ) = 163.24[W/m^2 K]…(1)
A is heater surface area -> π*D*L (area of side)

2. Hilpert correlation
Before calculate convection coefficient, you need to calculate the flow velocity by the simple Bernoulli equation,
u= √(2×ΔP/ρ)…(2) ΔP is pressure chnage=360Pa
Density is calculated with appendix.A table using interpolation method.
So, ρ=1.142[kg/m3]
Velocity=25.104[m/s]
And calculate Reynolds number.
Re_D=V*D/ γ =16354.7…(3) this value is in between 10^4 〖and 10〗^7 we can use Hilpert correlation.
(Nu) ̅_D≡(h ̅D)/k=C Re_D^m 〖Pr〗^(1/3)=69.273…(4)
C=0.193, m=0.618 (appendix.B)
Pr is calculated with appendix.A table using interpolation
Pr=(0.716(40-35.7)+0.712(35.7-20))/((40-20))=0.713
At the same way, k=0.027 [W/mK] and using equation (4) again
h= 185.78[W/m^2 K]

참고 자료

Textbook: Incropera’s principles of HEAT AND MASS TRANSFER WILEY GLOBAL EDITION
관리자. 공 (2019, December 09). Pitot tube Retrieved from https://mechengineering.tistory.com/450
Wikipedia contributors. (2021c, April 1). Convective heat transfer. Wikipedia. https://en.wikipedia.org/wiki/Convective_heat_transfer
Heat transfer. (2021, October 06). Retrieved October 10, 2021, from https://en.wikipedia.org/wiki/Heat_transfer
Dimensionless Number. (n.d.). Retrieved October 10, 2021, from https://www.sciencedirect.com/topics/chemistry/dimensionless-number
BOUNDARY LAYER. (n.d.). Retrieved October 10, 2021, from https://www.thermopedia.com/content/595/