Implementation Methodology of Heat Transfer Enhancement with Forced Convection

摘要

Implementation methodology of heat transfer enhancement was studied for nuclear plants design. The main goal of this study for heat transfer enhancement is to explain what the effect of forced convection is. As an amplification of the forced convection, it means an artificial flow of coolant for heat transfer enhancement. And then we body out forced convection with a certain device and design plan. The effect of forced convection is explained by using the Volume of Fluid (VOF) model of commercial CFD software named ANSYS. And then a system which can be bodied out in nuclear plants was studied to push hot liquid or bubbles out of neighboring area of heated surface. When an intricate piece of machinery of reactor core (/or U-shaped heat exchanger, condensers) is taken into consideration, an artificial flow of fluid can be bodied out through not only emitted hydraulic pressure from an impeller or outlets of induction pipes but also the naturally formed speed of moving fluid according to Bernoulli s principle. In tokamaks, an artificial flow of fluid which is produced from an impeller or outlets of induction pipes is bodied out. In the case of structure which produce forced convection or bubble pushing, the volume of provided cool liquid for bubble departure on the surface of heated surface is in proportion to speed of moving structure. In case of an artificial flow of fluid, volume of provided coolants or the speed of departure of bubbles is in proportion to speed (and flux and thermal energy difference of the artificial flow of fluid. This paper will focus on implementation method development, background theories, and expectation effectiveness.