Investigation on heat transfer characteristics and flow performance of Methane at supercritical pressures

International Conference on Innovative Technology, Engineering and Sciences 2018

工业技术;自然科学

Xian, Hong Wei^1,2 ; Oumer, A.N.^1 ; Basrawi, F.^1 ; Mamat, Rizalman^1 ; Abdullah, A.A.^1

Faculty of Mechanical Engineering, Universiti Malaysia Pahang, Pekan, Pahang

26600, Malaysia^1

Department of Mechanical Precision Engineering, Malaysia-Japan International Institute of Technology (MJIIT), Malaysia^2

关键词: Heat transfer and flows;    Heat transfer characteristics;    Heat transfer performance;    National Institute of Standards and Technology;    Performance parameters;    Regenerative cooling;    Super-critical pressures;    Thermo-physical property;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/342/1/012061/pdf
DOI  :  10.1088/1757-899X/342/1/012061

来源: IOP

【 摘 要 】

The aim of this study is to investigate the heat transfer and flow characteristic of cryogenic methane in regenerative cooling system at supercritical pressures. The thermo-physical properties of supercritical methane were obtained from the National institute of Standards and Technology (NIST) webbook. The numerical model was developed based on the assumptions of steady, turbulent and Newtonian flow. For mesh independence test and model validation, the simulation results were compared with published experimental results. The effect of four different performance parameter ranges namely inlet pressure (5 to 8 MPa), inlet temperature (120 to 150 K), heat flux (2 to 5 MW/m2) and mass flux (7000 to 15000 kg/m2s) on heat transfer and flow performances were investigated. It was found that the simulation results showed good agreement with experimental data with maximum deviation of 10 % which indicates the validity of the developed model. At low inlet temperature, the change of specific heat capacity at near-wall region along the tube length was not significant while the pressure drop registered was high. However, significant variation was observed for the case of higher inlet temperature. It was also observed that the heat transfer performance and pressure drop penalty increased when the mass flux was increased. Regarding the effect of inlet pressure, the heat transfer performance and pressure drop results decreased when the inlet pressure is increased.