Effects on pool boiling critical heat flux (CHF) with different direction and magnitude of additional accelerations due to rolling

Abstract

The effects of boiling behaviors and critical heat flux (CHF) under rolling motion were investigated using different directions and magnitude of additional accelerations. The rolling conditions are amplitudes of 10° and 30° and periods of 10 s and 20 s. Vapor behaviors and CHF were opposite between the heated surface placed above and below the rolling axis. When the heated surface was placed above the rolling axis, the centrifugal acceleration acts away from the heated surface, pulling the vapor to detach. However, the centrifugal acceleration acts toward the heated surface when the heated surface was placed below the rolling axis, increasing vapor attachment to the heated surface. By placing the heated surface above the rolling axis, CHF enhanced approximately by 31% and were reduced to approximately 23% compared to when the heated surface was placed below the rolling axis as the platform rolls faster and slower, respectively.