An Experimental Investigation of High-Flux Free Convection Heat Transfer to Water Up to Near-Critical Conditions

Holt, V.E.

doi:10.2172/4842984

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Griffith and Sabersky (8) Also Conducted Experiments On Near1

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1964

2022

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“…They concluded that these bubbles confirmed a previous postulation made to explain the high rates of heat transfer observed in near critical water in forced convection. 5 Holt (11) carried out experiments with water over a wide range of temperature and pressure using a heated wire and also a one-eighth inch high vertical ribbon. Because of the small height of the ribbon, none of his data was in the accepted turbulent regime of free convection, although boiling did occur.…”

Section: Griffith and Sabersky (8) Also Conducted Experiments On Nearmentioning

confidence: 99%

Turbulent free convection in near critical water

Larson¹,

Schoenhals

1964

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Section: Griffith and Sabersky (8) Also Conducted Experiments On Nearmentioning

confidence: 99%

Turbulent free convection in near critical water

Larson¹,

Schoenhals

1964

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Heat transfer analysis of a pulse-heated microwire in CO2 at supercritical pressures

Wang

2022

AIP Advances

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This paper analyzes the characteristics of convective heat transfer of a pulse-heated platinum microwire cooling in CO2 under supercritical pressures based on experimental data. The microwire undergoes a rapid temperature rise of around 664 K within 0.35 ms. An inverse problem is formulated and numerically solved to extract heat transfer data from experimental measurements. In addition, a predictive model for the convective heat transfer coefficient is developed to fully close the equation set. Results are interpreted based on the bulk pressure from 7.38 to 9 MPa and bulk temperature from 295 to 325 K. The convective heat flux of CO2 generally decreases with time, and in the medium-term, the reduction is slightly decelerated owing to buoyancy-driven flows. This demonstrates that high-pressure and low-temperature bulk states generally exert larger convective heat flux to cool the microwire. During the early 10 ms, the time-averaged convective heat flux is of the order of 1 MW/m2, resulting in rapid cooling. This value shows a weak critical enhancement upon crossing the Widom line. During the remaining time, the time-averaged convective heat flux drops to the order of 0.1 MW/m2. Such a drop in heat flux is more obvious in low-bulk-density cases, leading to a relatively long time for sufficient W cooling.

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An Experimental Investigation of High-Flux Free Convection Heat Transfer to Water Up to Near-Critical Conditions

Cited by 2 publications

References 5 publications

Turbulent free convection in near critical water

Turbulent free convection in near critical water

Heat transfer analysis of a pulse-heated microwire in CO2 at supercritical pressures

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