Experimental study on the difference of heat transfer characteristics between vertical and horizontal flows of supercritical pressure water

Lei, Xianliang; Li, Huixiong; Zhang, Weiqiang; Dinh, Truc-Nam; Guo, Yumeng; Yu, Shengping

doi:10.1016/j.applthermaleng.2016.11.051

Cited by 59 publications

(7 citation statements)

References 40 publications

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“…The effect of buoyancy and thermal-induced acceleration on supercritical heat transfer may vary when flow direction changes from the vertical flow to the horizontal flow. Li et al [ 12 ] experimentally studied the distinctions of heat transfer characteristics between horizontal and vertical upward flows of supercritical pressure water. It has been found that at high heat flux to mass flux ratio, the thermal-induced acceleration is the key factor leading to heat transfer deterioration in the vertical flow.…”

Section: Introductionmentioning

confidence: 99%

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Cheng

Tao

Zhu

et al. 2018

Applied Thermal Engineering

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This article presented a numerical investigation of supercritical heat transfer of hydrocarbon fuel in a series of horizontal tubes with different diameters. It has been carried out by solving Reynolds averaging equations of mass, momentum and energy with the LS low-Reynolds number turbulence model using the pressure-based segregated solver based on the finite volume method. For the purpose of comparison, a four-species surrogate model and a ten-species surrogate model of aviation kerosene RP-3 (Rocket Propellant 3) were tested against the published experimental data. In the current study, tube diameter varied from 2 mm to 10 mm and pressure was 3 MPa with heat flux to mass flux ratios ranging from 0.25 to 0.71 kJ/kg. It has been found that the buoyancy has significant effect on wall temperature non-uniformity in the horizontal tube. With the increase of diameter, the buoyancy effect enhances and the thermal-induced acceleration effect reduces. The buoyancy effect makes wall temperature at the top and bottom generatrices of horizontal tube increase and decrease, respectively. Due to the coupled effect of buoyancy and thermal-induced acceleration caused by the significant change of the properties, as diameter increases, heat transfer deteriorates dramatically at the top generatrix but remains almost unchanged at the bottom generatrix at high heat flux to mass flux ratio. Heat transfer enhancement is observed at low heat flux to mass flux ratio when tube diameter is less than 6 mm. Moreover, the safety analysis has been performed in order to optimally design the supercritical cooling system.

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Section: Introductionmentioning

confidence: 99%

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Cheng

Tao

Zhu

et al. 2018

Applied Thermal Engineering

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“…For a vertical upward flow, sharp temperature peaks are observed ( Figure 4 and Table 1). bulk enthalpy along a pipe: p = 1.05p crit [16] [17]. Table 1.…”

Section: Introductionmentioning

confidence: 99%

Performance of Heat Transfer Correlations Adopted at Supercritical Pressures: A Review

Shitsi¹,

Debrah²,

Agbodemegbe³

et al. 2018

WJET

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Research activities involving heat transfer at supercritical pressures have attracted attention in recent years because of possibility of increase in thermal output of heat transfer and industrial equipment. Because of high pressure and temperature conditions associated with heat transfer at supercritical pressures, only few experimental heat transfer studies are being carried out at supercritical conditions. The use of numerical tools for heat transfer and other related studies at supercritical pressures is increasing because of the high-pressure-temperature limitation of experimental studies at supercritical conditions. Heat transfer correlations implemented in these numerical tools are used to obtain numerical heat transfer data to complement experimental heat transfer data provided through experimental studies. In order to further broaden the understanding of fluid flow and heat transfer, this review examines the performance of heat transfer correlations adopted at supercritical pressures. It is found from the review that most of the correlations could predict heat transfer quite well in the low enthalpy region and few of the correlations could predict heat transfer in the high enthalpy region near critical and pseudo-critical conditions (heat transfer deteriorated conditions). However, no single heat transfer correlation is able to accurately predict all the experimental results presented in this work.

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“…During this evolution, buoyancy played an important role in heat transfer at supercritical pressures. A number of research papers [35][36][37][38] discussed the effect of buoyancy on heat transfer in supercritical fluids.…”

Section: Introductionmentioning

confidence: 99%

“…evolution, buoyancy played an important role in heat transfer at supercritical pressures. A number of research papers [35][36][37][38] discussed the effect of buoyancy on heat transfer in supercritical fluids. From the above literature review, it can be observed that mixed convection heat transfer in supercritical CO2, flowing vertically in a uniformly-heated circular tube at low mass flux, has not received much research attention.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Convective Heat Transfer of Supercritical Carbon Dioxide at Low Mass Fluxes

Lei

Zhang

et al. 2017

Applied Sciences

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Featured Application: Supercritical carbon dioxide Brayton cycle, geothermal system, nuclear reactor.Abstract: Significant differences in the heat transfer behaviors of supercritical carbon dioxide in a heated channel have been observed at different mass fluxes. At low mass fluxes, a unique heat transfer characteristic is accompanied by a monotonously smooth temperature variation without any temperature peak, even though the ratio of heat flux to mass flux (q/G) is high. In this study, experimental and numerical investigations explore the hidden mechanism of the peculiar heat transfer characteristics of supercritical carbon dioxide at low mass fluxes in vertically upward tubes with inside diameters (ID) of 5 mm. The range of operating conditions examined within the study include a mass flux (G) between 0-200 kg/m 2 s, and a heat flux (q) of up to 120 kW/m 2 . The parametric effects within these experimental conditions were analyzed on the basis of the obtained heat transfer data. Furthermore, a qualitative modeling force analysis and quantitative numerical simulation of vertical flow at low mass flux reveal the heat transfer mechanism for these temperature profiles. In addition, the distribution of flow parameters and thermo-physical properties (such as shear stress, density, and specific heat) in the near-wall region were also studied. It is found that the heat transfer behavior of supercritical CO 2 at low mass flux is similar to "film boiling" at subcritical pressure, where "vapor-like" fluid occupies the sublayer region. Due to reduced buoyancy, the fluid does not cause enough mixing/instability to bring it to the bulk flow.

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Experimental study on the difference of heat transfer characteristics between vertical and horizontal flows of supercritical pressure water

Cited by 59 publications

References 40 publications

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Performance of Heat Transfer Correlations Adopted at Supercritical Pressures: A Review

Experimental and Numerical Investigation of Convective Heat Transfer of Supercritical Carbon Dioxide at Low Mass Fluxes

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