Abstract
Supercritical H2O/CO2 mixtures are the working fluid in a novel power generation system with coal gasified in supercritical water, so their heat transfer behaviors are important to design heat transfer devices. However, heat transfer to supercritical mixtures has received few attention. Here, we designed and established an apparatus to measure the forced convection coefficients and constant pressure heat capacities of H2O/CO2 mixtures in both near-critical and supercritical regions. The highest mixture temperature is designed to be 873 K with the highest pressure of 25 MPa and with the CO2 mass fraction up to 25%. Results show that our apparatus is stable in both near-critical and supercritical regions, which is challenging for high-temperature and high-pressure experiments. Furthermore, our apparatus has lower uncertainties than those in previous studies.
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