Numerical investigation on the heat transfer coefficient jump in tilted single-phase natural circulation loop and coupled natural circulation loop

The present study investigates the effect of inclination on buoyancy driven systems. A cavity, Natural Circulation Loop (NCL) and Coupled (CNCL) have been used to represent possible classes There are extensive studies cavity systems which exhibit a heat transfer coefficient jump upon change in as system moves from one steady state another. primary objective is investigate if similar behavior occurs natural circulation such an NCL CNCL, using 2-D CFD study. identifies combination flow pattern rearrangement direction reversal phenomena responsible for coefficient. 3-D also conducted demonstrate universality phenomena. validated thoroughly with numerical experimental data available literature. parametric examine effects aspect ratio, Rayleigh number, Prandtl number plane system.