Results 121 to 130 of about 822 (152)
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Prediction of condensation pressure drop inside herringbone microfin tubes
International Journal of Refrigeration, 2011Abstract A generalized prediction correlation of condensation pressure drop inside herringbone microfin tubes has been proposed which includes the new empirical correlation of two-phase frictional multiplier and author’s previously proposed correlation of single-phase friction factor for herringbone microfin tubes. Three existing correlations and the
Hasan M.M. Afroz, Akio Miyara
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Theoretical analysis of annular film flow evaporation inside microfin tube
International Journal of Heat and Mass Transfer, 2021Abstract This study developed a theoretical model of film evaporation heat transfer in the microfin tube under a high vapour quality region. A liquid film flow model in the micro groove was constructed. The thickness and heat transfer characteristics in the thin-film region and meniscus region were analysed. As a result, the heat transfer coefficient
Jiayao Liu +3 more
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Heat Transfer Mechanisms for Condensation and Vaporization Inside a Microfin Tube
Journal of Enhanced Heat Transfer, 2002Experimental tests using R22 were conducted to measure the condensation coefficient and the vaporization coefficient inside a given microfin tube (Wolverine DX-75). Data were also taken for nucleate pool boiling on a plain surface and on the microfin surface.
DEL COL, DAVIDE +2 more
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R1234yf condensation inside a 3.4 mm ID horizontal microfin tube
International Journal of Refrigeration, 2017Abstract This paper shows experimental results about R1234yf condensation inside a microfin tube with an inner diameter at the fin tip of 3.4 mm. R1234yf is a new environmentally friendly refrigerant, with a Global Warming Potential lower than 1, therefore it matches the new environmental laws.
Andrea Diani +2 more
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R1234ze(E) flow boiling inside a 3.4 mm ID microfin tube
International Journal of Refrigeration, 2014R1234ze(E) has a ...
DIANI, ANDREA +2 more
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Review of In-Tube Condensation Heat Transfer Correlations for Smooth and Microfin Tubes
Heat Transfer Engineering, 2003This article provides a comprehensive review of the published literature on inside-tube condensation heat transfer correlations for smooth and microfin tubes with an emphasis on correlations used in air conditioning and refrigeration. The correlations presented are discussed and evaluated with experimental data from different authors for different ...
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Modelling of evaporation and condensation pressure drop in microfin tubes
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2005A semi-empirical model to predict the pressure drop of pure refrigerants and refrigerant mixtures in microfin tubes for both condensation and evaporation is presented. The new pressure-drop model is based on an existing smooth-tube correlation. The model was validated using experimental data compiled from published literature and this showed that the ...
L M Chamra, P J Mago, M-O Tan, C-C Kung
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A Theoretical Study of Film Condensation in Horizontal Microfin Tubes
Journal of Heat Transfer, 2001A stratified flow model of film condensation in helically grooved, horizontal microfin tubes has been developed. The height of stratified condensate was estimated by extending the Taitel and Dukler model for a smooth tube to a microfin tube. For the upper part of the tube exposed to the vapor flow, laminar film condensation due to the combined effects ...
Hiroshi Honda +2 more
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Effects of fin shape on condensation in herringbone microfin tubes
International Journal of Refrigeration, 2003Effects of fin height and helix angle on condensation inside a herringbone microfin tube have been experimentally investigated with five types of herringbone microfin tubes. Heat transfer coefficients are about 2–4 times higher than that of the helical microfin tube under high mass velocity conditions.
Akio Miyara +3 more
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R1224yd(Z) Flow Boiling inside a Mini Microfin Tube
2019This paper presents the R1224yd(Z) flow boiling heat transfer and pressure drop measurements inside a mini microfin tube with internal diameter at the fin tip of 4.2 mm. The microfin tube was brazed inside a copper plate and electrically heated from the bottom. Sixteen T-type thermocouples are located in the copper plate to monitor the wall temperature.
G. A. Longo +3 more
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