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Flow boiling heat transfer of R134a and R245fa in a 2.3 mm tube
(PERGAMON-ELSEVIER SCIENCE LTD, 2010)
This paper presents new experimental flow boiling heat transfer results in micro-scale tubes. The experimental data were obtained in a horizontal 2.3 mm I.D stainless steel tube with heating length of 464 mm, R134a and ...
Flow Boiling Characteristics for R1234ze(E) in 1.0 and 2.2 mm Circular Channels
(ASME-AMER SOC MECHANICAL ENGNEW YORK, 2012)
Experimental flow boiling heat transfer results are presented for horizontal 1.0 and 2.2 mm I. D. (internal diameter) stainless steel tubes for tests with R1234ze(E), a new refrigerant developed as a substitute for R134a ...
New prediction methods for CO2 evaporation inside tubes: Part II - An updated general flow boiling heat transfer model based on flow patterns
(PERGAMON-ELSEVIER SCIENCE LTD, 2008)
Corresponding to the updated flow pattern map presented in Part I of this study, an updated general flow pattern based flow boiling heat transfer model was developed for CO2 using the Cheng-Ribatski-Wojtan-Thome [L. Cheng, ...
Experimental investigation of wall nucleation characteristics in flow boiling
(American Society of Mechanical Engineers, 2015-05)
Wall nucleation experiments have been performed in a vertical annulus test section for investigation of the bubble departure diameter and bubble departure frequency. The experimental data in forced convective subcooled ...
Evaluation of flow patterns and elongated bubble characteristics during the flow boiling of halocarbon refrigerants in a micro-scale channel
(ELSEVIER SCIENCE INC, 2010)
In the present study, quasi-diabatic two-phase flow pattern visualizations and measurements of elongated bubble velocity, frequency and length were performed. The tests were run for R134a and R245fa evaporating in a stainless ...
Film thickness measurement techniques applied to micro-scale two-phase flow systems
(ELSEVIER SCIENCE INC, 2010)
Recently semi-empirical models to estimate flow boiling heat transfer coefficient, saturated CHF and pressure drop in micro-scale channels have been proposed. Most of the models were developed based on elongated bubbles ...
Estudo experimental da transferência de calor e queda de pressão na ebulição do isobutano em um mini-tubo
(Universidade do Vale do Rio dos Sinos, 2013-02-22)
This work presents an experimental study of heat transfer and pressure drop in flow boiling of hydrocarbon isobutane (R-600a) in a horizontal and circular mini-tube with 2.6 mm of inner diameter. It is also analyzed the ...
Estudo experimental da transferência de calor e queda de pressão na ebulição do isobutano em um mini-tubo
(Universidade do Vale do Rio dos Sinos, 2013-02-22)
This work presents an experimental study of heat transfer and pressure drop in flow boiling of hydrocarbon isobutane (R-600a) in a horizontal and circular mini-tube with 2.6 mm of inner diameter. It is also analyzed the ...
Two-phase flow patterns and pressure drop inside horizontal tubes containing twisted-tape inserts
(PERGAMON-ELSEVIER SCIENCE LTDOXFORD, 2012)
This paper presents an experimental study on two-phase flow patterns and pressure drop of R134a inside a 15.9 mm ID tube containing twisted-tape inserts. Experimental results were obtained in a horizontal test section for ...