Development and assessment of five-component wall boiling heat flux partitioning model

Analysis of Spatial Nonuniform Behaviors of Subcooled Flow Boiling Employing Euler–Lagrange Approach

“…Based on the validation presented in this section, all subsequent simulations will be conducted with u τ,c = C μ 1/4 k T 1/4 and F a = 6. However, this simplified method of increasing k T and F a may not be universally applicable for subcooled flow boiling with different physical properties, therefore, incorporating mechanically based bubble-induced turbulence and bubble sliding models into the Euler–Lagrange simulation remains to be researched in future numerical studies. ,, The y + is in the range of 38 to 103 for all numerical cases with u τ,c = C μ 1/4 k T 1/4 and F a = 6 in this paper. Note that the EL model is more efficient for the modeling of bubbly flow with small bubble sizes or subcooled flow boiling under the Critical Heat Flux, where the bubble influence area is smaller than unity.…”

“…Wall Heat Flux Partitioning Model. In this paper, a new wall heat flux (WHF) partitioning model that considers the effects of solid quenching, 31 based on the PRI model, 32 is incorporated into the Euler−Lagrange model. illustrates the solution procedure of the WHF partitioning model.…”

“…For compressible flow, the T c + need to be corrected to consider the viscous heating effect, which can refer to Wang et al 31 The model constant C μ = 0.09, κ = 0.41, E = 9.8, Pr t = 0.85, and Prandtl number Pr Numerous models for bubble nucleation, growth, and departure have been proposed in the literature, which have been reviewed by Yang et al 34 Although the commonly applied models for bubble nucleation, departure diameter, and departure frequency are based on Lemmert and Chawla, 35 Tolubinsky and Kostanchuk, 36 and Cole, 37 respectively, this paper adopts bubble departure diameter and frequency model based on dimensionless number proposed by Brooks and Hibiki. 38 The spatiotemporal averaged wall temperature values predicted by Brooks and Hibiki 38…”

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

“…The wall heat flux partitioning model is developed to describe the boiling heat flux from the heated wall to the bulk liquid. The total heat flux from the heated wall is partitioned as evaporation, single-phase convection, transient conduction, and solid quenching heat transfer in the wall heat flux partitioning model, which is calculated by Q t o t = f false( α l false) false( Q e + Q c + Q t c + q q s false) + false( 1 − f ( α l ) false) Q g c …”

“…Additionally, after the bubble grows to its departure diameter, it may either depart from the wall or continue to slide along the heated surface. The influence of bubble sliding has gradually been considered in numerical studies to improve the prediction of wall temperature …”