Abstract
The paper presents a theoretical study about turbulent film boiling on a horizontal tube with external flowing liquid. The high velocity flowing liquid is determined by potential flow theory. By using Colburn analogy, the present paper successfully addresses a new model to predict the vapor-liquid interfacial shear, applies the interfacial shear into the forced balance equation and then combines the forced balance equation, the energy equation and thermal energy balance equation. At last, both the film thickness and Nusselt number can be obtained. Besides, the present analysis also includes radiation effects, temperature ratio and eddy diffusivity. Finally, a comparison between the results of the present study and those reported in previous theoretical and experimental studies is provided.
Highlights
The research of film boiling on a horizontal tube was conducted by the pioneering investigator, Bromley [1]
The present paper considers the interfacial shear with high velocity liquid under the effects of turbulence; when the angular position increases, the non-linear temperature distribution of the profile is becoming more and more significant
The following conclusions can be drawn from the results of the present theoretical study: Figure 7
Summary
The research of film boiling on a horizontal tube was conducted by the pioneering investigator, Bromley [1]. After Bromley’s research, many related researches had been reported. In 1966, Nishikawa et al [2] analyzed two-phase boundary-layer treatment of free-convection film boiling. The theoretical study had been made of film boiling from an isothermal vertical plate and a horizontal cylinder without considering radiative effects. Jordan [3] investigated the laminar film boiling and transition boiling, and the separated region had been discussed. Sakurai et al [4] presented the pool film boiling on a horizontal cylinder with theoretical solutions. The analytical heat transfer model is based on laminar boundary theory including radiation effects.
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