Experimental study of flow boiling heat transfer and dryout characteristics at low mass flux in helically-coiled tubes

Hwang, Kyung Won; Kim, Dong Eok; Yang, Ki Hoon; Kim, Jin Man; Kim, Moo Hwan; Park, Hyun Sun

doi:10.1016/j.nucengdes.2014.03.046

Cited by 61 publications

(9 citation statements)

References 23 publications

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“…Hwang et al. 9 also found that the influence of secondary reflow on CHF was not negligible. Guo et al.…”

Section: Introductionmentioning

confidence: 97%

“…7,8 There have been numerous studies concerning CHF characteristics in helically coiled tubes over the past few decades. 5–26…”

Section: Introductionmentioning

confidence: 99%

“…The influence of the various flow conditions on CHF, including mass flux, 5–18 coil-to-diameter ratios, 5–7,15,25 vapor quality, 5–7,15,17,23 system pressure, 6,7,10–19,23 tube inclination, 10 and flow direction, 11 have been in-depth investigated. Hardik et al.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the available literature defined the CHF as the wall temperature rising sharply when the heat flux increases slightly. 5,9,11,13–15,19,21,23 Some scholars measured the CHF as the wall temperature oscillations obviously. 12,18 Guo et al.…”

Section: Introductionmentioning

confidence: 99%

“…Hwang et al. 9 and Zhang et al. 16 considered wall temperature rises of 50 ℃ and 20 ℃ as a sign of heat transfer deterioration with water as the working fluid.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on critical heat flux during flow boiling of R134a in a vertical helically coiled tube

Niu

Yuan

Zhao

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper carried out an experimental study on the critical heat flux during flow boiling of R134a in a vertical helically coiled tube. The length, inner diameter, coil diameter, and pitch of the test tube were 1.85 m, 8 mm, 205 mm, and 25 mm, respectively. Experiments cover the mass flux range of 190–400 kg·m−2·s−1, heat flux of 15–55 kW·m−2, inlet pressure of 0.8–1.1 MPa, and inlet vapor quality of 0.01–0.35. The effects of critical heat flux identification method, mass flux, system pressure, and inlet vapor quality on critical heat flux were presented. The critical heat flux obtained by the wall temperature rise method was larger than that obtained by the wall temperature oscillation method. The deviation of the critical heat flux corresponding to two methods, including wall temperature rises sharply above 10 ℃ and wall temperature drastic oscillation, was about 20% under the present experimental conditions. The critical heat flux increased with mass flux while it decreased with the inlet vapor quality and pressure. The experiment data were compared with four existing empirical correlations. A new correlation is proposed for critical heat flux prediction in vertical helical tubes.

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“…Hwang et al. 9 also found that the influence of secondary reflow on CHF was not negligible. Guo et al.…”

Section: Introductionmentioning

confidence: 97%

“…7,8 There have been numerous studies concerning CHF characteristics in helically coiled tubes over the past few decades. 5–26…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Hwang et al. 9 and Zhang et al. 16 considered wall temperature rises of 50 ℃ and 20 ℃ as a sign of heat transfer deterioration with water as the working fluid.…”

Section: Introductionmentioning

confidence: 99%

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