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Single-phase heat transfer and pressure drop characteristics of microfin tubes.

Author(s) : CHIOU C. B., WANG C. C., LU D. C.

Summary

Single-phase transfer as well as pressure drop characteristics for microfin tubes with a nominal diameter of 9.52 mm are reported. Experiments were conducted in a double-pipe heat exchanger with water as the working medium. Two commercially available microfin tubes and a smooth tube were tested. The heat transfer coefficients were obtained using the Wilson plot technique. It was found that the microfin tube exhibits a rough tube's characteristics. In the low and medium Reynolds number range (lower than 15,000), the roughness Reynolds number lies in the transition range (lower than 23). As a result, the Dittus-Boelter-type Wilson plot function cannot correlate the heat transfer data well in this range. It was found that by using a heat momentum analogy, a better correlation of the present microfin heat transfer data is achieved.

Details

  • Original title: Single-phase heat transfer and pressure drop characteristics of microfin tubes.
  • Record ID : 1997-0747
  • Languages: English
  • Source: ASHRAE Transactions.
  • Publication date: 1995/06/24
  • Document available for consultation in the library of the IIR headquarters only.

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