scholarly journals Heat Transfer Correlations of Supercritical Fluids

2020 ◽  
Author(s):  
Fangbo Li ◽  
Binbin Pei ◽  
Bofeng Bai
Keyword(s):  
Heat Transfer ◽  
Supercritical Fluids ◽  
Heat Transfer Correlations

Heat Transfer in Supercritical Fluids: A Review

2020 ◽  
Author(s):  
Kapil Bodkha ◽  
N.K. Maheshwari
Keyword(s):  
Heat Transfer ◽  
Supercritical Fluids ◽  
Scaling Laws ◽  
Nuclear Reactor ◽  
Fluid Behavior ◽  
Potential Applications ◽  
Transfer Behavior ◽  
Model Fluid ◽  
Heat Transfer Correlations ◽  
Thermo Physical Properties

Abstract SuperCritical (SC) fluids find potential applications in the upcoming energy systems due to various advantages associated with them. One of such applications is nuclear reactor where supercritical water and carbon-dioxide, both are proposed as the coolants in advanced reactor designs. Higher efficiency, simplified systems, lower operational costs are some of the advantages which propels the research fraternity to employ these fluids in application. However, there are also some challenges associated with the use of these fluids. Heat transfer behaviour of these fluids is one among them. As SC fluids undergo tremendous changes in thermo-physical properties across pseudo-critical point, heat transfer may get affected. It may get enhanced, deteriorated or remain unaltered. Various studies, experimental and analytical, have been carried out in the past using SC fluids to evaluate their heat transfer behavior. Various heat transfer correlations have been proposed by researchers catering to different operating range of parameters. Also, studies have been dedicated by researchers to investigate fluid-to-fluid scaling of SC fluids based on which scaling laws were proposed by them. This way prototypic fluid behavior can be predicted if the model fluid conditions are known. This paper presents a latest review of the scaling laws and heat transfer correlations applicable to SC fluids. Illustrations have also been presented considering reference experimental data from literature to get a feel about how these scaling laws fare among themselves. Various heat transfer correlations have been compared and important observations have also been discussed in this article.

Comparison of Existing Supercritical Carbon Dioxide Heat Transfer Correlations for Horizontal and Vertical Bare Tubes

2012 ◽  
Author(s):  
Prabu Surendran ◽  
Sahil Gupta ◽  
Tiberiu Preda ◽  
Igor Pioro
Keyword(s):  
Heat Transfer ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Wall Temperature ◽  
Statistical Error ◽  
Heat Fluxes ◽  
Transfer Coefficients ◽  
Bulk Fluid ◽  
Heat Transfer Correlations ◽  
Supercritical Carbon

This paper presents a thorough analysis of ability of various heat transfer correlations to predict wall temperatures and Heat Transfer Coefficients (HTCs) against experiments on internal forced-convective heat transfer to supercritical carbon dioxide conducted by Koppel [1], He [2], Kim [3] and Bae [4]. It should be noted the Koppel dataset was taken from a paper which used the Koppel data but was not written by Koppel. All experiments were completed in bare tubes with diameters from 0.948 mm to 9 mm for horizontal and vertical configurations. The datasets contain a total of 1573 wall temperature points with pressures ranging from 7.58 to 9.59 MPa, mass fluxes of 400 to 1641 kg/m2s and heat fluxes from 20 to 225 kW/m2. The main objective of the study was to compare several correlations and select the best of them in predicting HTC and wall temperature values for supercritical carbon dioxide. This study will be beneficial for analyzing heat exchangers involving supercritical carbon dioxide, and for verifying scaling parameters between CO2 and other fluids. In addition, supercritical carbon dioxide’s use as a modeling fluid is necessary as the costs of experiments are lower than supercritical water. The datasets were compiled and calculations were performed to find HTCs and wall and bulk-fluid temperatures using existing correlations. Calculated results were compared with the experimental ones. The correlations used were Mokry et al. [5], Swenson et al. [6] and a set of new correlations presented in Gutpa et al. [7]. Statistical error calculations were performed are presented in the paper.

scholarly journals Computational examination of two-phase microchannel heat transfer correlations with conjugate heat spreading

2019 ◽  
Vol 132 ◽  
pp. 68-79 ◽  
Author(s):  
Bryan E. Burk ◽  
Torben P. Grumstrup ◽  
Taylor A. Bevis ◽  
Jack Kotovsky ◽  
Todd M. Bandhauer
Keyword(s):  
Heat Transfer ◽  
Two Phase ◽  
Heat Transfer Correlations ◽  
Heat Spreading

Influence of Radial Rotation on Heat Transfer in a Rectangular Channel With Two Opposite Walls Roughened by Hemispherical Protrusions at High Rotation Numbers

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
Shyy Woei Chang ◽  
Tong-Miin. Liou ◽  
Wei-Chun Chen
Keyword(s):  
Heat Transfer ◽  
Infrared Thermography ◽  
Rotation Number ◽  
Rectangular Channel ◽  
Flow Region ◽  
Transfer Data ◽  
Nusselt Numbers ◽  
Rotation Numbers ◽  
Heat Transfer Correlations ◽  
Rotating Channel

Detailed heat transfer distributions over two opposite leading and trailing walls roughened by hemispherical protrusions were measured from a rotating rectangular channel at rotation number up to 0.6 to examine the effects of Reynolds (Re), rotation (Ro), and buoyancy (Bu) numbers on local and area-averaged Nusselt numbers (Nu and Nu¯) using the infrared thermography. A set of selected heat transfer data illustrates the Coriolis and rotating buoyancy effects on the detailed Nu distributions and the area-averaged heat transfer performances of the rotating channel. The Nu¯ for the developed flow region on the leading and trailing walls are parametrically analyzed to devise the empirical heat transfer correlations that permit the evaluation of the interdependent and individual Re, Ro, and Bu effect on Nu¯.

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