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    Deterioration and Instability of Heat Transfer to H2O/CO2 Mixtures in Near-Critical Region for Horizontal Flow

    Source: ASME Journal of Heat and Mass Transfer:;2023:;volume( 145 ):;issue: 005::page 54501-1
    Author:
    Zhang, Hanlin
    ,
    Liu, Dong
    ,
    Li, Qiang
    DOI: 10.1115/1.4055959
    Publisher: 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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      Deterioration and Instability of Heat Transfer to H2O/CO2 Mixtures in Near-Critical Region for Horizontal Flow

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4291970
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    contributor authorZhang, Hanlin
    contributor authorLiu, Dong
    contributor authorLi, Qiang
    date accessioned2023-08-16T18:26:44Z
    date available2023-08-16T18:26:44Z
    date copyright1/12/2023 12:00:00 AM
    date issued2023
    identifier issn2832-8450
    identifier otherht_145_05_054501.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4291970
    description abstractIn 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.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleDeterioration and Instability of Heat Transfer to H2O/CO2 Mixtures in Near-Critical Region for Horizontal Flow
    typeJournal Paper
    journal volume145
    journal issue5
    journal titleASME Journal of Heat and Mass Transfer
    identifier doi10.1115/1.4055959
    journal fristpage54501-1
    journal lastpage54501-8
    page8
    treeASME Journal of Heat and Mass Transfer:;2023:;volume( 145 ):;issue: 005
    contenttypeFulltext
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