The Westinghouse-3 (W-3 or W3 or W 3) correlation for evaluation of critical heat flux (CHF)
Posted by Syeilendra Pramuditya on September 16, 2009
There are about 500 empirical correlations out there (o yeah the world is HUGE man! :mrgreen:) to predict the critical heat flux (CHF), one of the most widely used correlations is (was?) the Westinghouse-3 (W-3) correlation. For predicting the CHF condition in a non-uniform heat flux channel, we follow these two steps:
- The uniform critical heat flux is computed with the W-3 correlation
- The non-uniform critical heat flux distribution is then obtained by employing the so-called “F factor“.
For uniformly heated channels, the critical heat flux is given by:
The axially non-uniform heat flux is obtained by applying a corrective F factor to the uniform critical heat flux:
The correlation is valid in the ranges:
Source: N.E. Todreas and Mujid S. Kazimi, Nuclear Systems I – Thermal Hydraulic Fundamentals, Hemisphere Publishing Corporation, New York (1990), page 558.
- Material from MIT [quickview]
- Material from NCSU [quickview]
- Material from Forschungszentrum Karlsruhe [quickview]
A variation of this W-3 correlation is the so-called W-3L correlation, which employs a correction factor to take into account the effect from grid spacer and/or mixing vane.