## Abstract The evaporation heat transfer model of stratified flow in helically grooved, horizontal microfin tubes was proposed. The profile of stratified liquid was determined using a theoretical model previously proposed for condensation in horizontal microfin tubes. The meniscus profile of strat
Condensation in horizontal tubes, part 2: new heat transfer model based on flow regimes
β Scribed by J.R. Thome; J. El Hajal; A. Cavallini
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 924 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0017-9310
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β¦ Synopsis
A new general flow pattern/flow structure based heat transfer model for condensation inside horizontal, plain tubes is proposed based on simplified flow structures of the flow regimes, and also includes the effect of liquid-vapor interfacial roughness on heat transfer. The model predicts local condensation heat transfer coefficients for the following flow regimes: annular, intermittent, stratified-wavy, fully stratified and mist flow. The new model has been compared to test data for 15 fluids (R-
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## R410A a b s t r a c t Experiments of flow boiling heat transfer were conducted in four horizontal flattened smooth copper tubes of two different heights of 2 and 3 mm. The equivalent diameters of the flattened tubes are 8.6, 7.17, 6.25, and 5.3 mm. The working fluids were R22 and R410A. The tes
A new mode1 for the heat transfer in turbulent pipe flow is presented based on a modified form of the mixing length theory developed by Cebeci [1] for boundary layer flow problems. The model predicts the velocity and temperature distributions and the Nusselt number for fluids with low, medium and hi