Peak Pool Boiling Heat-Flux Measurements on Finite Horizontal Flat Plates

Abstract

Experimental data obtained at both earth-normal and elevated gravity, in a variety of organic liquids and water, are used to verify the hydrodynamic theory for the peak pool boiling heat flux on flat plates. A modification of Zuber’s formula, which gives a 14 percent higher peak heat flux, is verified as long as the flat plate is more than three Taylor wavelengths across. For smaller heaters, the hydrodynamic theory requires a wide variation in heat flux owing to discontinuities in the number of escaping jets. Data for smaller plates bear out this predicted variation with heat fluxes that range between 40 percent and 235 percent of Zuber’s predicted value. Finally, a method is suggested for augmenting the peak heat flux on large heaters, and shown experimentally to be viable.

A new mechanistic model for pool boiling CHF on horizontal surfaces

“…Fig. 10 compares the predicted CHF using the lift-off model with methanol CHF data collected by Lienhard et al [27] and Bailey et al [25], Freon-113 CHF data collected by Sterman and Korychanek [29], Abuaf and Staub [30], and Samokhin and Yagov [26] and Benzene CHF data collected by Sterman and Korychanek [29]. At both low and moderate pressure the agreement is generally quite good.…”

“…Fig. 9 compares the predicted CHF based on the lift-off model with water data published by Lienhard et al [27], Yagov [28], Bailey et al [25], and Sakashita and Ono [9]. While the predicted trend with increasing pressure is good, the CHF is under-predicted.…”

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

“…Lienhard et al [85] first proposed that critical heat flux would increase for a finite heater size compared to the assumption of an infinite size for the heated plate. Several subsequent experimental studies [86][87][88][89] investigated pool boiling from decreasing heat input areas and confirmed an increase in critical heat flux.…”

Nucleate Pool Boiling eXperiment (NPBX) in microgravity: International Space Station

“…Hence while the heater surface used in the present study can be considered an infinite flat plat for the experiments performed at g/g e = 1, it should be considered a very small heater for the microgravity experiments. For small heaters (i.e., L c /k d < 3), the maximum heat flux predicted can be much larger than that for an infinite flat plat [12]. As such, the maximum heat flux obtained in microgravity experiments is much smaller than that would be predicted by hydrodynamic theory, when corrections for heater width (size) is taken into account.…”