Nucleate pool boiling, film boiling and single-phase free convection at pressures up to the critical state. Part I: Integral heat transfer for horizontal copper cylinders

Gorenflo, Dieter; Baumhögger, Elmar; Windmann, Thorsten; Herres, Gerhard

doi:10.1016/j.ijrefrig.2010.07.015

Cited by 24 publications

(8 citation statements)

References 14 publications

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“…858 1)3) <1 1)3) 1 1) 4 to 14 2) safety classification 4) A1 A2L 4) B1 A2L 5) (expected) Table 5 Relative bias and standard deviation of the predicted HTC from the experimental HTC. Stephan-Abdelsalam (1980) Ribatski-Jabardo (2003) Jung et al (2003) Gorenflo et al (2010 Refrigerant…”

Section: Discussionmentioning

confidence: 99%

Comparative assessment of condensation and pool boiling heat transfer on horizontal plain single tubes for R1234ze(E), R1234ze(Z), and R1233zd(E)

Nagata

Kondou

Koyama

2016

International Journal of Refrigeration

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R1234ze(Z), which has a global warming potential of less than 1, is a promising alternative refrigerant for high-temperature heat pumps designed for heat recovery in the industrial sector. The use of titanium as the material for heat exchangers exposed to acid exhaust is one solution to prevent oxidation. In this study, the pool boiling heat transfer characteristics outside of horizontal titanium tubes were experimentally investigated for R1234ze(Z). A plain tube and three enhanced titanium tubes were tested at saturation temperatures from 10 to 60 °C and heat fluxes from 0.55 to 79.8 kW m-2. Compared to the plain tube, the tested enhanced tube exhibited a 2.8 to 5.1 times higher heat transfer coefficient, on average, in the test range, which could compensate for the disadvantage in the thermal conductivity of titanium. The enhancement ratio predominantly depends on the saturation temperature and the wall heat flux. At conditions of higher saturation temperatures and lower heat fluxes, where smaller bubbles are observed, test tubes with smaller opening width exhibit higher heat transfer coefficients. The experimental results indicate the importance of fin geometry optimization to the operation conditions.

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Section: Discussionmentioning

confidence: 99%

Comparative assessment of condensation and pool boiling heat transfer on horizontal plain single tubes for R1234ze(E), R1234ze(Z), and R1233zd(E)

Nagata

Kondou

Koyama

2016

International Journal of Refrigeration

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“…• Among the selected correlations, Gorenflo et al (2010) showed the best agreement with the experimental data of the copper plain tube. Nevertheless, this correlation considerably deviated from the data of titanium plain tubes because the material parameter used in this correlation is not valid for titanium tubes.…”

Section: Discussionmentioning

confidence: 86%

“…Among the selected correlations, the correlations of Gorenflo et al (2010) and RibatskiJabardo (2003) show the best agreement with the experimental HTC for the copper tube and the titanium tube, respectively. Nevertheless, the Grenflo et al (2010) correlation considerably deviates from the experimental HTC of the titanium tube because the fwm in Eq.…”

Section: Plain Tubes -Copper and Titanium Tubesmentioning

confidence: 87%

“…The decrement is greater for TE01 Stephan-Abdelsalam (1980) 33.6 24.5 20.4 9. 2 Jung et al (2003) 8.7 17.2 -2.9 10.5 Ribatski-Jabardo (2003) 12.0 13.3 0.7 5.8 Gorenflo et al (2010) 4.0 7.9 93.9 38.6 but much moderate for TE03, therefore the rank of enhancement ratio is interchanged between TE01 and TE03. In general, at lower saturation temperatures, most fluids show lower nucleate boiling HTC mainly due to their greater surface tension.…”

Section: Plain Tubes -Copper and Titanium Tubesmentioning

confidence: 99%

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Enhancement of R1234ze(Z) pool boiling heat transfer on horizontal titanium tubes for high-temperature heat pumps

Nagata

Kondou

Koyama

2017

Science and Technology for the Built Environment

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R1234ze(Z), which has a global warming potential of less than 1, is a promising alternative refrigerant for hightemperature heat pumps designed for heat recovery in the industrial sector. The use of titanium as the material for heat exchangers exposed to acid exhaust is one solution to prevent oxidation. In this study, the pool boiling heat transfer characteristics outside of horizontal titanium tubes were experimentally investigated for R1234ze(Z). A plain tube and three enhanced titanium tubes were tested at saturation temperatures from 10 to 60 °C and heat fluxes from 0.55 to 79.8 kW m-2. Compared to the plain tube, the tested enhanced tube exhibited a 2.8 to 5.1 times higher heat transfer coefficient, on average, in the test range, which could compensate for the disadvantage in the thermal conductivity of titanium. The enhancement ratio predominantly depends on the saturation temperature and the wall heat flux. At conditions of higher saturation temperatures and lower heat fluxes, where smaller bubbles are observed, test tubes with smaller opening width exhibit higher heat transfer coefficients. The experimental results indicate the importance of fin geometry optimization to the operation conditions.

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“…The Laplace reference length was defined as the characteristic length to distinguish tube and wire conditions. Gorenflo et al [11] obtained the experimental data of film boiling over a horizontal tube with methane over the range of pressure between atmosphere and critical pressure. Pomerantz [12] performed film boiling experiments over a horizontal tube in an increased gravitation field and proved the validity of Bromley's equation within a certain range.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Pool Film Boiling of Liquid Hydrogen over Horizontal Cylinders

Wang

2022

Energies

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Due to the low boiling point of hydrogen, the boiling phenomenon is usually encountered in the applications of liquid hydrogen. The underlying mechanism as well as the physical performance of film boiling over horizontal cylinders are not yet fully understood, especially for the various diameters. In this paper, pool film boiling of hydrogen over horizontal cylinders with diameters ranging from 0.2 to 30 mm is investigated based on the volume-of-fluid method. By the analysis of the gas–liquid interface evolution and the heat transfer mechanism, the cylinders are divided into wire heaters, transition heaters, and tube heaters. The results show that the heat transfer of the wire is affected by the evolution of a single bubble, while the heat transfer of the tube is mainly affected by the movement of multiple crescent-shaped gas structures along the surface. Besides, with the increase in cylinder diameter, the bubble detachment diameter increases, the heat flux decreases correspondingly, and the bubble growth period experiences a complicated principle.

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Nucleate pool boiling, film boiling and single-phase free convection at pressures up to the critical state. Part I: Integral heat transfer for horizontal copper cylinders

Cited by 24 publications

References 14 publications

Comparative assessment of condensation and pool boiling heat transfer on horizontal plain single tubes for R1234ze(E), R1234ze(Z), and R1233zd(E)

Comparative assessment of condensation and pool boiling heat transfer on horizontal plain single tubes for R1234ze(E), R1234ze(Z), and R1233zd(E)

Enhancement of R1234ze(Z) pool boiling heat transfer on horizontal titanium tubes for high-temperature heat pumps

Numerical Study on Pool Film Boiling of Liquid Hydrogen over Horizontal Cylinders

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