ISSN Online: 2688-7231
ISBN Online: 978-1-56700-524-0
Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
Thermalhydraulic Assessment of Supercritical CO2 filled Double-cooled Annular Channel
A double-cooled annular channel that is cooled with inner and outer channel sides by supercritical carbon dioxide (sCO2) has several benefits in heat transfer. One of the main significant advantages is the capacity to carry more heat than a single-cooled annular channel. In present numerical study, the thermal-hydraulic characteristics of sCO2 have been numerically evaluated. The total computational domain length was considered as 2.6 m, in which adiabatic and heated section 0.5 m and 2 m, respectively, and flow divider section length 0.1 m. Numerical parameters were included the mass flux (300 to 1000 kg/m2·s), power (12 kW), system pressure (8 to 9 MPa) and inlet bulk fluid temperature (296 K). In the report, the heat transfer enhancement (HTE) was obtained
at high mass flux conditions (450 to 1000 kg/m2·s). But, a further mass flux increment (750 to 1000 kg/m2·s) exhibit no significant effect in reducing the wall temperature of both inner and outer channel. Apart from the HTE, the HTD was not seen in both inner and outer channels at a low mass flux (300 kg/m2·s). But, the wall temperature appeared high in the inner channel relative to the outer channel. The effect of pressure was also found for HTC in both channels, especially close to the pseudocritical bulk enthalpy region rather than the entire bulk enthalpy region. Besides, both channels wall temperatures were seen unaffected with varying operating pressure against the entire bulk enthalpy.