대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제27권8호
  • /
  • Pages.1051-1060
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  • 2003
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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테프론 코팅 전열관 표면으로의 열 및 물질 전달 특성에 관한 실험적 연구

Experimental Study on the Characteristics of Heat and Mass Transfer on the Teflon Coated Tubes

  • 이장호 (포항공과대학교 대학원 기계공학과) ;
  • 김형대 (포항공과대학교 대학원 기계공학과) ;
  • 김정배 (포항공과대학교 대학원 기계공학과) ;
  • 김무환 (포항공과대학교 기계공학과)
  • 발행 : 2003.08.01
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초록

The heat and mass transfer on two kinds of tube surfaces (bare stainless steel tube and Teflon coated tube) in steam-air mixture flow are experimentally studied to obtain design data for the heat exchanger of the latent heat recovery from flue gas. In the test section, 3-tubes are horizontally installed, and steam-air mixture is vertically flowed from the top to the bottom. The pitch between tubes is 67mm, the out-diameter of tube is 25.4mm, and the thickness is 1.2mm ; blockage factor (cross sectional tube area over the cross sectional area of the test section) is about 0.38. All of sensors and measurement systems (RTD, pressure sensor, flow-meter, relative humidity sensor, etc.) are calibrated with certificated standard sensors and the uncertainty for the heat transfer measurement is surveyed to have the uncertainty within 7%. As experimental results, overall heat transfer coefficient of the Teflon (FEP) coated tube is degraded about 20% compared to bare stainless tube. The degradation of overall heat transfer coefficient of Teflon coated tube comes from the additional heat transfer resistance due to Teflon coating. Its magnitude of heat transfer resistance is comparable to the in-tube heat transfer resistance. Nusselt and Sherwood numbers on Teflon (FEP) coated surface and bare stainless steel surface are discussed in detail with the contact angles of the condensate.

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참고문헌

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