Forced convective heat transfer to supercritical helium.

Ito, Tetsuo; Kasao, Daisaku; Yamaguchi, M.; Mori, Hiromu; Hara, T.

doi:10.2221/jcsj.21.327

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“…Note that the Prandtl number has an index 'h', meaning that the enthalpy profile depends on local material properties. Equation (6) can now be used to rewrite equation (5) into:…”

Section: Derivationmentioning

confidence: 99%

A heat transfer - friction analogy for fluids at supercritical pressure

Peeters

Rohde

2019

The Journal of Supercritical Fluids

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A new friction-heat transfer analogy for the prediction of heat transfer to turbulent fluids at supercritical pressure is presented. This analogy is based on the observation that the predominent events that determine the turbulent heat flux known as hot ejections and cold sweeps have different thermophysical properties. This observation is used to derive a new friction-heat transfer analogy, which we call the ejection-sweep analogy. It is shown that the ejection-sweep analogy yields very good results with respect to predicting heat transfer coefficients for different fluids (water, CO 2 , Helium, R22 and R134a) that are heated at supercritical pressure at low heat flux to mass flux ratios. Furthermore, the new analogy performs much better than the Chilton-Colburn analogy. The new analogy was also compared with two well-known relations from literature. It was found that the ejection-sweep analogy predictions are more consistent with respect to the investigated fluids than the relations from literature and that the analogy can be applied to at least all fluids studied in this work. The ejection-sweep analogy can be used in the development of more advanced heat transfer models that include buoyancy and acceleration effects.

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“…Note that the Prandtl number has an index 'h', meaning that the enthalpy profile depends on local material properties. Equation (6) can now be used to rewrite equation (5) into:…”

Section: Derivationmentioning

confidence: 99%

A heat transfer - friction analogy for fluids at supercritical pressure

Peeters

Rohde

2019

The Journal of Supercritical Fluids

View full text Add to dashboard Cite

show abstract

Forced convective heat transfer to supercritical helium.

Cited by 1 publication

References 1 publication

A heat transfer - friction analogy for fluids at supercritical pressure

A heat transfer - friction analogy for fluids at supercritical pressure

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