@Article{,
title={DEVELOPMENT SEMI-EMPIRICAL FORMULA TO PREDICT MASS FLOW RATE OF WORKING FLUID WITHIN THERMOSYPHON LOOP},
author={Basim Hammed Freegah and Khalil Ibrahim Abass and Ammar Abdullah Hussain},
journal={Journal of Engineering and Sustainable Development (JEASD) مجلة الهندسة والتنمية المستدامة},
volume={22},
number={2 (part-6)},
pages={141-149},
year={2018},
abstract={In this study, detailed investigations of the natural convection phenomenon in a single-phase thermosyphon cycle have been carried out employing an advanced Computational Fluid Dynamics (CFD) based techniques. The investigations have included the effects of increasing the number of risers and increasing the risers’ length with the constant diameter under various values of heat flux, on the rate of mass flow of the working fluid in the cycle of thermosyphon. A value of instantaneous solar heat flux has been applied at the beginning of each time step. The results have shown that the heat flux, the increasing the risers’ length and number of riser pipes have important effects on the mass flow rate of the working fluid within the thermosyphon cycle. Furthermore, the rates summation of the mass flow of the working fluid passing at all risers is equal to the rate of mass flow through the downcoer pipe. In equation to predict Re number and hence calculate the rate of mass flow of the working fluid in the thermosyphon cycle has been established. An addition, the developed equation can give an average percentage difference of 8%. Therefore, this equation can be used with approximately 92 % of accuracy}
}