Investigation on Flow and Heat Transfer of Supercritical CO2 in Helical Coiled Tubes at Various Supercritical PressuresN. Thiwaan Rao, Ahmed. N. Oumer, G. Devandran and M.M. NoorMATEC Web Conf., 225 (2018) 01018DOI: https://doi.org/10.1051/matecconf/201822501018