Heat Transfer and Friction in Turbulent Pipe Flow with Variable Physical Properties

Petukhov, B. S.

doi:10.1016/s0065-2717(08)70153-9

Cited by 1,291 publications

(501 citation statements)

References 11 publications

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“…13.B shows the Nu-Re curves given by different correlations. The classical correlations of Gnielinski [57], Dittus and Boelter [61] and Pethukov et al [62] are in reasonable agreement with each other, within 20 % for Re > 3000. The correlations of Choi et al [63] and of Yu et al [64], proposed for microchannels, show completely different trends of variation for Nu with Re both with the standard correlations and with themselves.…”

Section: Measurement Uncertaintiessupporting

confidence: 67%

“…Only a few of the examined papers presented results for the turbulent regime and they agree sometimes with the classical correlations of Gnielinski [57], Dittus and Boelter [61] and Pethukov [62] and sometimes with the correlation of Adams et al [10], proposed specifically for microchannels. Fig.…”

Section: Measurement Uncertaintiessupporting

confidence: 67%

“…The experimental results of Bucci et al [22] Summarizing, since there are seem to be no new phenomena in microchannels, the classical correlations or data of Hausen [23] or Shah and London [21] to predict the heat transfer in thermally developing laminar flows may safely be used, but only for 1D flows and when all the scaling effects can be neglected. For turbulent flows, the suitability of the classical correlations of Gnielinski [57], Dittus and Boelter [61] and Pethukov et al [62] is still an open matter, but based on the results of this review they seem to be quite reliable at least for d h > 300-500 μm. Table 4 reports the criteria and/or suggestion to state whether a particular scaling effect is negligible.…”

Section: Measurement Uncertaintiesmentioning

confidence: 88%

“…Moreover, these correlations can be used for different cross section geometries and boundary conditions. Equations (24)(25), (26) and (27) give the correlations of Gnielinski [57], Dittus and Boelter [61] and Pethukov et al [62], respectively.…”

Section: Measurement Uncertaintiesmentioning

confidence: 99%

“…Certain correlations specific for microchannels need further verification/improvement;  in the turbulent regime, further research is needed to state which one is the most suitable correlation. Both the classical correlations of Gnielinski [57], Dittus and Boelter [61], Pethukov et al [62] and the microchannel correlation of Adams et al [10] …”

Section: Recommendationsmentioning

confidence: 99%

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Single-phase heat transfer in microchannels: The importance of scaling effects

Rosa

Karayiannis

Collins

2009

Applied Thermal Engineering

254

117

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Microscale single-phase heat transfer is widely used in industrial and scientific applications and for this reason, many related papers have been published in the last two decades. Nevertheless, inconsistencies between published results still exist and there is no generally accepted model for the prediction of singlephase heat transfer in microchannels. This paper presents a review of the experimental and numerical results available in the open literature. Heat transfer in microchannels can be suitably described by standard theory and correlations, but scaling effects (entrance effects, conjugate heat transfer, viscous heating, electric double layer (EDL) effects, temperature dependent properties, surface roughness, rarefaction and compressibility effects), often negligible in macro-channels, may now have a significant influence and have to be accounted for. Furthermore, measurement uncertainties may be more important, due to the reduced characteristic dimensions, so have to be accurately checked and, where possible, reduced. Experiments with single channels are more accurate and in good agreement with predictions from published correlations, in contrast to multi-(parallel) channel experiments. The latter are subject to maldistribution, 3D conjugate heat transfer effects and larger measurement uncertainties. Sub-continuum mathematical models for fluid dynamics are briefly reviewed and explained. These models are expected to gain a growing interest in the near future due to the rapid descent of microchannel dimensions down to the nano-scale. The paper concludes with a concise set of recommendations for purposes of performance and design. For single channels, available correlations for macro-channels can also give reliable predictions at the micro-scale, but only if all the scaling effects can be considered negligible. Otherwise, when scaling effects cannot be neglected or for the case of heat exchangers with parallel channels, suitable numerical simulations may be the sole alternative to carefully designed experiments to evaluate the heat transfer rates. KeywordsMicrochannels, scaling effects, measurement uncertainties, sub-continuum effects.

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Section: Measurement Uncertaintiessupporting

confidence: 67%

Section: Measurement Uncertaintiessupporting

confidence: 67%

Section: Measurement Uncertaintiesmentioning

confidence: 88%

Section: Measurement Uncertaintiesmentioning

confidence: 99%

Section: Recommendationsmentioning

confidence: 99%

See 3 more Smart Citations

Single-phase heat transfer in microchannels: The importance of scaling effects

Rosa

Karayiannis

Collins

2009

Applied Thermal Engineering

254

117

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Storage of Energy

Mawardi¹

2003

Digital Encyclopedia of Applied Physics

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Engineering Analysis of Heat Transfer

Klausner

2010

Encyclopedia of Aerospace Engineering

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As was discussed in the Volume 1, Chapter 37, thermal energy transport can be quite complex and typically involves multimode heat transfer. In order to provide useful tools for engineering designers to analyze multimode heat transfer problems, idealizations and simplifications are necessary so that the dominant direction and mode of energy flow can be captured. Concepts such as thermal resistance and thermal circuits are thus very useful for analyzing such problems in conjunction with the energy conservation principle as will be discussed. In addition, these ideas will be extended to analyze heat transfer equipment using the log mean temperature difference (LMTD) and the number of transfer units (NTU).

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Heat Transfer and Friction in Turbulent Pipe Flow with Variable Physical Properties

Cited by 1,291 publications

References 11 publications

Single-phase heat transfer in microchannels: The importance of scaling effects

Single-phase heat transfer in microchannels: The importance of scaling effects

Storage of Energy

Engineering Analysis of Heat Transfer

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