Heat transfer in annular passages—hydrodynamically developed turbulent flow with arbitrarily prescribed heat flux

Kays, W. M.; Leung, E.Y.

doi:10.1016/0017-9310(63)90012-7

Cited by 229 publications

(54 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For their turbulent heat transfer results, Sudo et al [14] are not able to distinguish any difference between one-sided and two-sided heating in their prototypic MTR channel. In a semi-empirical study of flow in annular spaces, Kays and Leung [26] analytically extended their experimental results for heated annuli to the case of parallel plates, determining that the Nusselt number for one-sided heating is lower than that for heating on both sides, where the effect has a strong dependence on the Prandtl number. Using their tabulated solutions, it is possible to plot the ratio of Nusselt numbers for one-sided heating to two-sided heating, under otherwise similar conditions.…”

Section: Discussionmentioning

confidence: 99%

Convective Heat Transfer in a High Aspect Ratio Minichannel Heated on One Side

Forrest

Buongiorno

et al. 2015

Journal of Heat Transfer

View full text Add to dashboard Cite

Experimental results are presented for single-phase heat transfer in a narrow rectangular minichannel heated on one side. The aspect ratio and gap thickness of the test channel were 29:1 and 1.96 mm, respectively. Friction pressure drop and Nusselt numbers are reported for the transition and fully turbulent flow regimes, with Prandtl numbers ranging from 2.2 to 5.4. Turbulent friction pressure drop for the high aspect ratio channel is well-correlated by the Blasius solution when a modified Reynolds number, based upon a laminar equivalent diameter, is utilized. The critical Reynolds number for the channel falls between 3500 and 4000, with Nusselt numbers in the transition regime being reasonably predicted by Gnielinski's correlation. The dependence of the heat transfer coefficient on the Prandtl number is larger than that predicted by circular tube correlations, and is likely a result of the asymmetric heating. The problem of asymmetric heating condition is approached theoretically using a boundary layer analysis with a two-region wall layer model, similar to that originally proposed by Prandtl. The analysis clarifies the influence of asymmetric heating on the Nusselt number and correctly predicts the experimentally observed trend with Prandtl number. A semi-analytic correlation is derived from the analysis that accounts for the effect of aspect ratio and asymmetric heating, and is shown to predict the experimental results of this study with a mean absolute error (MAE) of less than 5% for 4000 < Re < 70,000.

show abstract

Section: Discussionmentioning

confidence: 99%

Convective Heat Transfer in a High Aspect Ratio Minichannel Heated on One Side

Forrest

Buongiorno

et al. 2015

Journal of Heat Transfer

View full text Add to dashboard Cite

show abstract

“…Some problems connected with the wall temperature calculation when using the Hammouda model are considered by Agafonova & Paramonova (2013). It was shown that the temperature variation across the near-wall vapor layer and therefore the change in the physical properties of vapor may be considerable and produces an essential effect on the heat transfer and drag friction in vapor as compared with their values at constant physical properties of vapor (Petukhov, 1967;Kays & Leunge, 1963). According to our calculations (Agafonova & Paramonova, 2013) for the conditions of the experiments by Chen (2011) the wall temperature (t w , o C) was nearly two or three times as large as compared with the interfacial surface (or the liquid core surface) temperature which is equal to the saturation temperature (t s , o C).…”

Section: Heat Transfer and The Wall Temperature Calculations In The Imentioning

confidence: 99%

“…According to our calculations (Agafonova & Paramonova, 2013) for the conditions of the experiments by Chen (2011) the wall temperature (t w , o C) was nearly two or three times as large as compared with the interfacial surface (or the liquid core surface) temperature which is equal to the saturation temperature (t s , o C). It is known (Petukhov, 1967;Kays & Leunge, 1963) that for given situation: where Nu -the Nusselt number at the varying physical properties; Nu nc -the Nusselt number at the constant physical properties.…”

Section: Heat Transfer and The Wall Temperature Calculations In The Imentioning

confidence: 99%

The Improvement of the Wall Temperature Calculation Procedure for the Post-Crisis Region of the NPP Heated Channels

Agafonova¹,

Paramonova²

2014

MER

View full text Add to dashboard Cite

The reliable wall temperature prediction is important for the analysis of operation and safety of both nuclear reactors and direct-flow steam generators with high-temperature fluids. The onset of dangerous temperature excursion is possible in the post-crisis region of the heated channels when the inverted annular or the dispersed flow regime occurs. The wall temperature calculations for both flow regimes are represented. The data of Hammouda, Lapperiere, Chen, Miropolsky, Bennett and some other investigators were processed. The obtained average error and deviation are less than those which take place when special best estimate computer code KORSAR is used. Specified result was reached by the way of the engineering procedures correction and may be applied for the closure correlations improvement which is needed in two-fluid two-phase flow models. The conclusion is made that the correct choice of the integration step and the method of the critical quality determination produce effect on the adequate wall temperature prediction.

show abstract

“…We have measured the heat transfer and the friction factor of the tube specimen in the helium flow loop, testing the operating capabilities of the apparatus. We chose the tube geometry because it has been studied extensively (e.g., Ede, 1961, Kays andLeung, 1962), and there are correlations for fully developed turbulent flow in circular tubes which we can compare to our results. We note that these correlations were developed for conditions of much lower heat flux, and for geometries which allowed better access to wall and fluid temperatures, than for our specimen.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer in a compact tubular heat exchanger with helium gas at 3.5 MPa

Olson

Glover²

1990

View full text Add to dashboard Cite

Heat transfer in annular passages—hydrodynamically developed turbulent flow with arbitrarily prescribed heat flux

Cited by 229 publications

References 4 publications

Convective Heat Transfer in a High Aspect Ratio Minichannel Heated on One Side

Convective Heat Transfer in a High Aspect Ratio Minichannel Heated on One Side

The Improvement of the Wall Temperature Calculation Procedure for the Post-Crisis Region of the NPP Heated Channels

Heat transfer in a compact tubular heat exchanger with helium gas at 3.5 MPa

Contact Info

Product

Resources

About