Deterioration and Instability of Heat Transfer to H2O/CO2 Mixtures in Near-Critical Region for Horizontal FlowSource: ASME Journal of Heat and Mass Transfer:;2023:;volume( 145 ):;issue: 005::page 54501-1DOI: 10.1115/1.4055959Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this work, we experimentally investigated the deterioration and instability of heat transfer to H2O/CO2 mixtures in the near-critical region, following our series of works on their normal and enhanced heat transfer, hydraulic resistance, and thermophysical properties. The experimental pressure is 24 MPa, temperatures are 330–400 °C, CO2 mass fractions are 9.8 and 15.0%, mass fluxes are above 940 kg/m2/s, heat fluxes are below 211 kW/m2, and flow is horizontal. Experiments show that the heat transfer deterioration for the supercritical H2O/CO2 mixture occurs when the fluid temperature is lower than the pseudo-critical temperature (Tpc) and the wall temperature is higher than Tpc, similar to the condition for supercritical pure fluids, but the onset heat flux is much lower. Results also show that the heat transfer instability for the supercritical H2O/CO2 mixture occurs not only moderately near Tpc (similar to supercritical pure fluids) but also more significantly near the critical miscible temperature. All of these distinct phenomena were attributed to the mixture feature.
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contributor author | Zhang, Hanlin | |
contributor author | Liu, Dong | |
contributor author | Li, Qiang | |
date accessioned | 2023-08-16T18:26:44Z | |
date available | 2023-08-16T18:26:44Z | |
date copyright | 1/12/2023 12:00:00 AM | |
date issued | 2023 | |
identifier issn | 2832-8450 | |
identifier other | ht_145_05_054501.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4291970 | |
description abstract | In this work, we experimentally investigated the deterioration and instability of heat transfer to H2O/CO2 mixtures in the near-critical region, following our series of works on their normal and enhanced heat transfer, hydraulic resistance, and thermophysical properties. The experimental pressure is 24 MPa, temperatures are 330–400 °C, CO2 mass fractions are 9.8 and 15.0%, mass fluxes are above 940 kg/m2/s, heat fluxes are below 211 kW/m2, and flow is horizontal. Experiments show that the heat transfer deterioration for the supercritical H2O/CO2 mixture occurs when the fluid temperature is lower than the pseudo-critical temperature (Tpc) and the wall temperature is higher than Tpc, similar to the condition for supercritical pure fluids, but the onset heat flux is much lower. Results also show that the heat transfer instability for the supercritical H2O/CO2 mixture occurs not only moderately near Tpc (similar to supercritical pure fluids) but also more significantly near the critical miscible temperature. All of these distinct phenomena were attributed to the mixture feature. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Deterioration and Instability of Heat Transfer to H2O/CO2 Mixtures in Near-Critical Region for Horizontal Flow | |
type | Journal Paper | |
journal volume | 145 | |
journal issue | 5 | |
journal title | ASME Journal of Heat and Mass Transfer | |
identifier doi | 10.1115/1.4055959 | |
journal fristpage | 54501-1 | |
journal lastpage | 54501-8 | |
page | 8 | |
tree | ASME Journal of Heat and Mass Transfer:;2023:;volume( 145 ):;issue: 005 | |
contenttype | Fulltext |