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(A+) ์„ฑ๊ท ๊ดฟ’๋Œฟ’ํ•™๊ป“ ๊ธฐ๊ณ„๊ณตํ•™๋ถ€ - ์—ด์œ ์ฒด๊ณตํ•™์„ค๊ณ„์‹ค์Šต Heat transfer

"(A+) ์„ฑ๊ท ๊ดฟ’๋Œฟ’ํ•™๊ป“ ๊ธฐ๊ณ„๊ณตํ•™๋ถ€ - ์—ด์œ ์ฒด๊ณตํ•™์„ค๊ณ„์‹ค์Šต Heat transfer"์— ๋Œ€ํ•œ ๋‚ด์šฉ์ž…๋‹ˆ๋‹ค.
11 ํŽ˜์ด์งฟ’
์›Œ๋“œ
์ตœ์ดˆ๋“ฑ๋ก์ผ 2020.12.26 ์ตœ์ข…์ ฟ’์ž‘์ผ 2020.09
11P ๋ฏธ๋้ฉ๋ณด๊ธฐ
(A+) ์„ฑ๊ท ๊ดฟ’๋Œฟ’ํ•™๊ป“ ๊ธฐ๊ณ„๊ณตํ•™๋ถ€ - ์—ด์œ ์ฒด๊ณตํ•™์„ค๊ณ„์‹ค์Šต Heat transfer
  • ๋ฏธ๋้ฉ๋ณด๊ธฐ

    ๋ชฉ์ฐจ

    1. Result
    1) Data
    2) Convection coefficient by Newtonโ€™s cooling law
    3) Convection coefficient by Hilpert correlation
    4) Convection coefficient by Churchill and Bernstein equation

    2. Discussion
    1) Error in Newton's cooling law
    2) Error in Hilpert correlation

    3. Conclusion

    4. References

    5. Appendices

    ๋ณธ๋ๅฉ๋‚ด์šฉ

    1.3 Convection coefficient by Hilpert correlation

    Hilpert correlation can be expressed in the following [Equation 2]. The coefficient of convection heat transfer can then be obtained using the Nusselt number derived in [Equation 3].
    Density(ฯ), Thermal conductivity(K_air), Prandtl number(Pr) should be calculated at Film temperature. According to [Table 2], these constants could be calculated. We use linear interpolation to find Density(ฯ), Thermal conductivity(K_air), Prandtl number(Pr) at Film temperature(T_f=23.65โ„ƒ) in advance.

    1.4 Convection coefficient by Churchill and Bernstein equation

    We can calculate Nusselt number, convection coefficient by the Churchill and Bernstein correlation as well. The equation is as follow.

    2 Discussion

    Compare the convection heat transfer coefficient, calculated by the three method.
    In this situation, we assume that Churchill and Bernstein correlationโ€™s coefficient is the exact solution.

    ์ฐธ๊ณ ์ž๋ฃŒ

    ยท Heat and Mass control lab. โ€œLab3. Convection heat transfer (2020-2)โ€, Mechanical engineering, Sungkyunkwan Univ.
    ยท Heat and Mass control lab. โ€œHeat trans_Final report data_exampleโ€, Mechanical engineering, Sungkyunkwan Univ.
    ยท Frank M. White, (2016) Fluid mechanics, 8th Ed. McGraw-Hill, New York
    ยท โ€œHeat transferโ€ Internet
    ยท https://en.wikipedia.org/wiki/Heat_transfer, September. 21, 2020
    ยท โ€œDimensionless numberโ€ Internet
    ยท https://en.wikipedia.org/wiki/Dimensionless_numbers_in_fluid_mechanics, September. 21, 2020
    ยท โ€œConvective Heat Transfer Coefficientโ€ Internet
    ยท https://www.nuclear-power.net/nuclear-engineering/heat-transfer/convection-convective-heat-transfer/convective-heat-transfer-coefficient/, September. 21, 2020
    ยท โ€œPitot tubeโ€ Internet
    ยท https://en.wikipedia.org/wiki/Pitot_tube, September. 21, 2020
    ยท โ€œExamples of Convection In Everyday Lifeโ€ Internet
    ยท https://studiousguy.com/examples-convection-everyday-life/, September. 21, 2020
    ยท โ€œVelocity Boundary Layer โ€“ Thermal Boundary Layerโ€ Internet
    ยท https://www.nuclear-power.net/nuclear-engineering/fluid-dynamics/boundary-layer/velocity-boundary-layer-thermal-boundary-layer/, September. 21, 2020
  • ์ž๋ฃŒํ›„๊ธฐ

    Ai ๋ฆฌ๋ทฐ
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      ํ•ดํ”ผ์บ ํผ์Šค FAQ ๋”๋ต–๊ธฐ

      ๊ผญ ์•Œ์•„์ฃผ์„ธ์š”

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        ์ €์ž‘๊ถŒ์นจํ•ด, ๋ช…์˜ˆํ›ผ์† ๋“ฑ ๋ถ„์Ÿ ์š”์†Œ ๋ฐœ๊ฒฌ ์‹œ ๊ณ ๊ฐ๋น„๋ฐ”์นด์ง€๋…ธ Viva์˜ ์ €์ž‘๊ถŒ์นจํ•ด ์‹ ๊ณ ๋น„๋ฐ”์นด์ง€๋…ธ Viva๋ฅผ ์ด์šฉํ•ด ์ฃผ์‹œ๊ธฐ ๋ฐ”๋ž๋‹ˆ๋‹ค.
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        ํŒŒ์ผ์˜ค๋ฅ˜ ์ค‘๋ณต์ž๋ฃŒ ์ €์ž‘๊ถŒ ์—†์Œ ์„ค๋ช…๊ณผ ์‹ค์ œ ๋‚ด์šฉ ๋ถˆ์ผ์น˜
        ํŒŒ์ผ์˜ ๋‹ค์šด๋กœ๋“œ๊ฐ€ ์ œ๋Œ€๋กœ ๋˜์ง€ ์•Š๊ฑฐ๋‚˜ ํŒŒ์ผํ˜•์‹์— ๋งž๋Š” ํ”„๋กœ๊ทธ๋žจ์œผ๋กœ ์ •์ƒ ์ž‘๋™ํ•˜์ง€ ์•Š๋Š” ๊ฒฝ์šฐ ๋‹ค๋ฅธ ์ž๋ฃŒ์™ฟ’ 70% ์ด์ƒ ๋‚ด์šฉ์ด ์ผ์น˜ํ•˜๋Š” ๊ฒฝ์šฐ (์ค‘๋ณต์ž„์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋Š” ๊ทผ๊ฑฐ ํ•„์š”ํ•จ) ์ธํ„ฐ๋„ท์˜ ๋‹ค๋ฅธ ์‚ฌ์ดํŠธ, ์—ฐ๊ตฌ๊ธฐ๊ด€, ํ•™๊ป“, ์„œ์  ๋“ฑ์˜ ์ž๋ฃŒ๋ฅผ ๋„์šฉํ•œ ๊ฒฝ์šฐ ์ž๋ฃŒ์˜ ์„ค๋ช…๊ณผ ์‹ค์ œ ์ž๋ฃŒ์˜ ๋‚ด์šฉ์ด ์ผ์น˜ํ•˜์ง€ ์•Š๋Š” ๊ฒฝ์šฐ

    ํ•จ๊ป˜ ๊ตฌ๋งคํ•œ ์ž๋ฃŒ๋„ ํ™•์ธํ•ด ๋ณด์„ธ์š”!

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    ์ €๋Š” ์•„๋ž˜์™ฟ’ ๊ฐ™์ด ์ž‘์—…์„ ๋„์™ฟ’๋“œ๋ฆฝ๋‹ˆ๋‹ค.
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    - ์žฅ๋ฌธ์˜ ์ฝ˜ํ…์ธ ๋ฅผ ์‰ฝ๊ณ  ๋น ๋ฅด๊ฒŒ ์ž‘์„ฑํ•ด ๋“œ๋ฆฝ๋‹ˆ๋‹ค.
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    - ์œ ์•„์—๊ฒŒ ์ ํ•ฉํ•œ ๋ฌธํ•™์ž‘ํ’ˆ์˜ ๊ธฐ์ค€๊ณผ ํŠน์„ฑ
    - ํ•œ๊ตญ์ธ์˜ ๊ฐ€์น˜๊ด€ ์ค‘์—์„œ ์ •์‹ ์  ๊ฐ€์น˜๊ด€์„ ์ด๋ฃจ๋Š” ๊ฒƒ๋“ค์„ ๋ฌธํ™”์  ๋ฌธ๋ฒ•์œผ๋กœ ์ •๋ฆฌํ•˜๊ณ , ํ˜„๋Œ€ํ•œ๊ตญ์‚ฌํšŒ์—์„œ ์ผ์–ด๋‚˜๋Š” ์‚ฌ๊ฑด๊ณผ ์‚ฌ๊ณ ๋ฅผ ๋น„๊ตํ•˜์—ฌ ์ž์‹ ์˜ ์˜๊ฒฌ์œผ๋กœ ๊ธฐ์ˆ ํ•˜์„ธ์š”
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