LIU Xinxin, YE Jian, XU Xiaoxiao, et al. Heat transfer characteristics of supercritical CO2 cooled in horizontal helically coiled tube[J]. CIESC Journal, 2016, (S2): 120-127. DOI: 10.11949/j.issn.0438-1157.20161357.
LIU Xinxin, YE Jian, XU Xiaoxiao, et al. Heat transfer characteristics of supercritical CO2 cooled in horizontal helically coiled tube[J]. CIESC Journal, 2016, (S2): 120-127. DOI: 10.11949/j.issn.0438-1157.20161357.DOI:
The convection heat transfer characteristics of supercritical CO2 cooled in horizontal helically coiled tube is studied experimentally and numerically.The effects of mass flux
heat flux and pressure on heat transfer for helically coiled tube are analyzed.The comparisons of the heat transfer coefficients are made between the straight tube and the helically coiled tube.And
the heating and cooling conditions for the helically coiled tube are compared.Results show that the heat transfer coefficient is lager in helically coiled tube than straight tube under the same condition.With the decrease of the mass flux and the increase of pressure
the heat transfer enhancement of the helically coiled tube is improved compared to the straight tube.For a given heat flux
the heat transfer coefficients are larger at cooling conditions than that at heating conditions in helically coiled tube.Furthermore
the heat transfer coefficients at heating conditions experience drastically oscillation due to the buoyancy force.