Carbon dioxide local heat transfer coefficients during flow boiling in a horizontal circular smooth tube. (English) Zbl 1177.80041
Summary: Carbon dioxide is gaining renewed interest as an environmentally safe refrigerant. In order to improve the energy efficiency of R744 systems, an accurate knowledge of heat transfer coefficients is fundamental.
In this paper experimental heat transfer coefficients during flow boiling of R744 in a smooth, horizontal, circular, 6.00 mm inner diameter tube are presented. We obtained 217 experimental points in 18 operating conditions commonly encountered in dry-expansion evaporators investigating the effect of the mass flux within the range from 200 to 349 kg/m\(^2\,\)s, the saturation temperature within the range from \(-7.8\) to \(5.8^\circ\)C, the heat flux within the range from 10.0 to 20.6 kW/m\(^2\) and the vapor quality within the range from 0.02 to 0.98.
An interpretation of the experimental trends based on the local circumferential distribution of heat transfer coefficients, the flow regimes and the thermophysical properties is proposed.
Besides the measured data are compared with those predicted by L. Cheng, G. Ribatski and J. R. Thome [Int. J. Heat Mass Transfer 51, No. 1–2, 125–135 (2008; Zbl 1140.80384)] and R. Yun, Y. Kim, M. S. Kim and Y. Choi [Boiling heat transfer and dryout phenomenon of CO\(_2\) in a horizontal smooth tube, Int. J. Heat Mass Transfer 46, 2353–2361 (2003)] correlations to determine the best predictive method for the tested operating conditions.
In this paper experimental heat transfer coefficients during flow boiling of R744 in a smooth, horizontal, circular, 6.00 mm inner diameter tube are presented. We obtained 217 experimental points in 18 operating conditions commonly encountered in dry-expansion evaporators investigating the effect of the mass flux within the range from 200 to 349 kg/m\(^2\,\)s, the saturation temperature within the range from \(-7.8\) to \(5.8^\circ\)C, the heat flux within the range from 10.0 to 20.6 kW/m\(^2\) and the vapor quality within the range from 0.02 to 0.98.
An interpretation of the experimental trends based on the local circumferential distribution of heat transfer coefficients, the flow regimes and the thermophysical properties is proposed.
Besides the measured data are compared with those predicted by L. Cheng, G. Ribatski and J. R. Thome [Int. J. Heat Mass Transfer 51, No. 1–2, 125–135 (2008; Zbl 1140.80384)] and R. Yun, Y. Kim, M. S. Kim and Y. Choi [Boiling heat transfer and dryout phenomenon of CO\(_2\) in a horizontal smooth tube, Int. J. Heat Mass Transfer 46, 2353–2361 (2003)] correlations to determine the best predictive method for the tested operating conditions.
MSC:
| 80A20 | Heat and mass transfer, heat flow (MSC2010) |
| 76T10 | Liquid-gas two-phase flows, bubbly flows |
| 80A22 | Stefan problems, phase changes, etc. |
| 80-05 | Experimental work for problems pertaining to classical thermodynamics |
Citations:
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