Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
SLIGHTLY ENHANCED SINGLE PHASE NATURAL CIRCULATION AT SMALL INCLINATION ANGLES
Submission Author:
Natasha Conceição , RJ
Co-Authors:
Natasha Conceição, Su Jian
Presenter: Natasha Conceição
doi://10.26678/ABCM.ENCIT2018.CIT18-0838
Abstract
A marine reactor is affected by the ship motion. In certain situations, the ships are inclined under small angles. This paper will investigate the fluid in a steady-state single-phase natural circulation of a rectangular circuit under small inclination angles. The rectangular natural circulation circuit is composed of a downcomer, a heater, a riser and a cooler. All of them have the same inner diameter. The inclination angle is measured between the heater and the horizontal and an one-dimensional model with Boussinesq approximation is adopted. The temperature distribution along the loop is determined by the energy conservation equation. The momentum conservation equation is integrated along the loop. The mass flow rate is analyzed for different inclination angles and different horizontal and vertical sizes of the loop. These implementations are performed in Wolfram Mathematica 11.2 Student Edition software. As the main result, the mass flow rate does not decrease immediately after varying the angle of inclination. There is an angle range that the mass flow rate increases to a maximum value, and then decreases. For a ship, this inclination angle range occurs frequently, and so, it is important to optimize the natural circulation to that the circulation ability is not so affected by the inclination.
Keywords
natural circulation, Inclination, Marine Reactor
