Assessment of VoF based numerical scheme for bubble rise in isothermal liquid layer, and some new insight in thermally stratified liquid layers

This paper aims at (a) improving the distribution, for the vertical velocity in the wake of a rising isolated bubble, for isothermal water layers, and (b) evaluating the proposed distribution for thermally stratified therminol layers, before and after the initiation of vortex shedding. To address these objectives, numerical investigations are performed, for the rise of an isolated bubble rising in isothermal and thermally stratified liquid layers, with the combination of Monotonic Upwind Scheme for Conservation Laws (MUSCL) and Pressure Implicit with Splitting of Operators (PISO) numerical scheme. The analysis revealed that the vertical velocity, in the wake of a rising isolated bubble, for isothermal and thermally stratified liquid layers, differs remarkably from the Gaussian distribution. Based on the detailed investigations, region-wise, wake velocity distribution, comprising a linear superposition of Gaussian approximation with Burr distribution, is proposed. Furthermore, this distribution is utilized to predict the rise velocity for a chain of rising bubbles, with the different frequencies of departure. Thus, the findings will be useful for the design of heat exchangers or cooling devices, which rely on the heat transfer augmentation with rising air bubbles, from a heated surface in isothermal (buoyancy suppressed) and thermally stratified (buoyancy assisted) liquid layers.

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Assessment of VoF based numerical scheme for bubble rise in isothermal liquid layer, and some new insight in thermally stratified liquid layers

Cited by 4 publications

References 28 publications

Effect of the heat flow distribution and thermophysical properties of the pipe wall and fluid on the wall temperature response to a rising Taylor bubble

Effect of the heat flow distribution and thermophysical properties of the pipe wall and fluid on the wall temperature response to a rising Taylor bubble

Thermal destratification of cryogenic liquid storage tanks by continuous bubbling of gases

Improved Wake Velocity Distribution Behind a Rising Bubble for Isothermal and Thermally Stratified Liquid Layers

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