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contributor authorZhang, Hanlin
contributor authorWu, Haomin
contributor authorLi, Sha
contributor authorLiu, Dong
contributor authorLi, Qiang
date accessioned2022-02-05T22:26:51Z
date available2022-02-05T22:26:51Z
date copyright11/16/2020 12:00:00 AM
date issued2020
identifier issn0022-1481
identifier otherht_143_02_024501.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4277548
description abstractHeat transfer to supercritical H2O/CO2 mixtures (24 MPa, 310 to 430 °C, and CO2 mass fractions up to 18.5%), the working fluids of a novel power generation system with coal gasified in supercritical water, was experimentally investigated for typical working conditions of this system. For these conditions, i.e., high mass velocities (above 1200 kg m−2 s−1) and low heat flux (below 300 kW m−2), the convection heat transfer coefficients (HTCs) of supercritical pure fluids usually increase with temperature, peak near the pseudo-critical point, i.e., heat transfer enhancement, and then decrease for higher temperatures. Here, we experimentally demonstrated a new heat transfer enhancement phenomenon for supercritical H2O/CO2 mixtures. A high-temperature and high-pressure apparatus was setup to measure the convection HTCs of the supercritical H2O/CO2 mixtures. Experimental results show that surprisingly two distinct peaks of convection HTCs appear, with one corresponding temperature being the pseudo-critical point of the H2O/CO2 mixture, i.e., the thermophysical property variation induced mechanism, and the other one being the critical miscible point of the mixture, i.e., the dissolution-induced mechanism. These results pave the way to efficient heat transfer devices that use supercritical mixtures as heat transfer fluids.
publisherThe American Society of Mechanical Engineers (ASME)
titleAnomalous Enhancement of Heat Transfer to H2O/CO2 Mixtures in Near-Critical Region
typeJournal Paper
journal volume143
journal issue2
journal titleJournal of Heat Transfer
identifier doi10.1115/1.4048826
journal fristpage024501-1
journal lastpage024501-7
page7
treeJournal of Heat Transfer:;2020:;volume( 143 ):;issue: 002
contenttypeFulltext


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