Surface Factors Influencing Burnout on Flat Heaters

Nanofluids and critical heat flux, experimental and analytical study

“…Also, Liaw and Dhair [13] showed that the surface contact angle can have a great influence on peak pool boiling heat flux. These results motivated Ramilison et al [11] to modify the critical heat flux equation for flat plates to account for surface characteristics, surface roughness and surface contact angle. Ramilison et al [11] accounted for these influences through a correction factor that is a function of surface roughness and surface contact angle.…”

“…In this work the models by Lienhard and Dhir [7] and Ramilison et al [11] were used as a starting point. In the model by Lienhard and Dhir [7] they evaluated critical heat flux by starting with the simple equation…”

“…The primary focus of this paper was to find an explanation for the influence of nanoparticles in regular fluids on the critical heat flux. With this in mind and taking into account our decision to use cylindrical heaters in our experimental set up, the Lienhard and Dhir [7] and Ramilison et al [11] models were used as the starting point of our analysis. All parameters relevant for evaluation of critical heat flux recognized by these models are evaluated in the case of nanofluids.…”

Experimental Study on Transient Boiling Heat Transfer and Critical Heat Flux on Horizontal Vertically-Oriented Ribbon with Different Surfaces under Atmospheric Conditions

“…Alternatively, CHF test using horizontal vertically oriented steel ribbon heaters under saturated pool boiling in FC-72 at atmospheric pressure revealed that surface roughness can increase CHF by 6 ~ 12% [12]. The CHF correlation which contains both surface roughness and contact angle on flat heaters was postulated taking account the influence of surface roughness [13]. In addition, porousity have strongly affected on CHF according to the separated tests with contact angle, porosity and roughness [8].…”

Heat transfer in nucleate pool boiling of multicomponent mixtures

“…Ramilison et al [36], while seeking to correlate the peak heat flux in terms of the surface micro-roughness and contact angle observed based on boiling data in the literature, that ''smooth'' (''rough'') and ''wetted'' (or ''non-wetted'') surfaces can be discussed only in connection with a surface-liquid combination. A ''smooth'' surface for one liquid can serve as a ''rough'' for another.…”