A New CHF Correlation Scheme Proposed for Vertical Rectangular Channels Heated From Both Sides in Nuclear Research Reactors

Abstract

In this study, an investigation was carried out to identify the important parameters affecting critical heat flux (CHF) in rectangular channels, focusing on the effects of flow direction, channel inlet subcooling from 1 to 213 K, the channel outlet condition extending from subcooling of 0–74 K to quality of 0–1.0, pressure of 0.1 to 4 MPa, water mass flux of −25,800 to + 6250 kg/m2s, and channel configuration. In particular, the effect of the outlet subcooling in upflow and downflow on the CHF was quantitatively investigated. As a result of this study, a new CHF scheme covering downflow, countercurrent flow, and upflow was established in the rectangular channels within the ranges of parameters investigated in this study.

Improvement of Critical Heat Flux Correlation for Research Reactors using Plate-Type Fuel

“…The minimum DNBR during the transient is calculated to be 1.6 and is predicted by using Eq. (3). This analytical result of DNBR is very close to the safety limit of 1.5.…”

“…5 to clarify the differences between Eqs. (3) and (8). The channel inlet subcooling of 30K corresponds to the dimensionless channel inlet subcooling of about 0.056 under the atmospheric pressure condition.…”

“…Equation (1) was proposed by Sudo and Kaminaga(3)(9) and Eqs. (2) and (3) are originally proposed by Mishimac7):…”

A review of the current thermal-hydraulic modeling of the Jules Horowitz Reactor: A loss of flow accident analysis

“…Most geometrically and thermal-hydraulically suitable CHF correlation for JHR implemented in FLICA4 are proposed by Sudo and Kaminaga (1993) and in the case of upflow:…”

Development of a steady thermal-hydraulic analysis code for the China Advanced Research Reactor

“…Sudo [4] correlation was developed on the basis of a great deal of CHF experimental data in rectangle channels and other classical q CHF correlations. It was adopted for thermalhydraulic design of JRR-3M [5] and its applicability under middle and high flow condition was verified.…”