Modulated wall motion approach for augmenting slug flow heat transfer between two micro-parallel plates

Vivekanand, S. V. B.; Raju, V. Ramachandra

doi:10.1063/1.5129511

Cited by 3 publications

(2 citation statements)

References 72 publications

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“…The simulation results showed that the backflow region shrank with increasing liquid flow rate and bubble velocity and a significant pressure drop occurred in film flow when passing through the minimum film area. Vivekanand et al [32] carried out numerical simulations of the effects of modulated wall motion on slug flow and heat transfer and showed that it significantly improved heat transfer. Most of those numerical simulations, which were based on their own models incorporating micro region contribution to heat transfer, have supported an important role of microlayer played to boiling heat transfer [28] , [33] .…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on flow boiling bubble motion under ultrasonic field in vertical minichannel by using bubble tracking algorithm

Xiao

Zhang

2023

Ultrasonics Sonochemistry

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on flow boiling bubble motion under ultrasonic field in vertical minichannel by using bubble tracking algorithm

Xiao

Zhang

2023

Ultrasonics Sonochemistry

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“…Results revealed that the heat transfer significantly increases with modulated wall temperature over unmodulated wall temperature boundary condition. Another study by Vivekanand and Raju (2020) examined the thermal performance of Taylor flow under modulated wall motion. They observed 23% improvement in heat transfer with modulated wall motion compared to unmodulated wall motion.…”

Section: Introductionmentioning

confidence: 99%

Boundary Condition Effect on Two-Phase Fluid Flow ‎and Heat Transfer inside 3-D Microchannels

2021

JAFM

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Two-phase Taylor flows play a vital role in dissipating heat effectively for the proper functioning of electronic systems. In the present study, the thermal performance of liquid-liquid Taylor flow was carried out in a 3D microchannel with uniform wall heat flux boundary for five different cases: uniform heat flux on the four walls, three walls, two opposite walls, single wall, and two adjacent walls, and the aspect ratio of microchannel was varied in the range of 0.2-5. The length of the microchannel was 4 mm, height and width were 0.1 mm each for a square microchannel. For varying aspect ratios of the microchannel, the height and width of the microchannel were taken in the range of 0.06-0.3 mm to keep the hydraulic diameter constant. Dodecane and water were the working fluids in the study and assumed to be Newtonian, incompressible, immiscible, and the properties of fluids were assumed to be independent of temperature. The pressure distribution in the microchannel was investigated under five thermal boundary cases and the aspect ratio effect on pressure drop was also discussed. Results showed Nusselt number of two-phase flow with four-wall heat flux increases up to 280% compared to liquid-only flow and it has been validated with standard heat transfer correlation available in the literature. A higher heat transfer rate (Nu=10.41) was recorded in the opposite walls boundary condition and the heat transfer rate (Nu=7.81) was minimum when the adjacent walls were subjected to uniform heat flux. The effect of microchannel aspect ratio on Taylor flow heat transfer under thermal boundary conditions was also analyzed.

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Flow and heat transfer for a two-phase slug flow in horizontal pipes: A mechanistic model

Dong

Zhang

2021

Physics of Fluids

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In view of the practical importance of gas–liquid two-phase flow in many applications, such as chemical engineering, petroleum engineering, nuclear engineering, etc., a reliable model of flow and heat transfer for two-phase flow is of practical importance in the two-phase flow analysis. Among various two-phase flow regimes, slug flow is most complicated due to the intrinsic randomness and intermittency. This paper aims at developing a novel mechanistic model of flow and heat transfer for two-phase slug flow in horizontal pipes. First, a hydrodynamic model of two-phase slug flow is developed using the concept of slug unit cell. Then, a heat transfer model is deduced based on the hydrodynamic model. The overall heat transfer coefficient is integrated by the local heat transfer coefficients of liquid slug, liquid film, and elongated bubble. The newly developed mechanistic model is well validated by the experimental results. Finally, the dependence of the heat transfer performance on the overall flow parameters, such as superficial liquid velocity and superficial gas velocity, and the local flow parameters, such as slug frequency, pressure drop, void fraction, and ratio of slug length to unit cell length, is comprehensively investigated. The heat transfer enhancement of two-phase slug flow compared with single-phase flow is mainly attributed to the turbulence increase in liquid by the injection of air and the decrease in thermal boundary layer by the frequent alternation between the liquid slug and the elongated bubble.

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Modulated wall motion approach for augmenting slug flow heat transfer between two micro-parallel plates

Cited by 3 publications

References 72 publications

Experimental investigation on flow boiling bubble motion under ultrasonic field in vertical minichannel by using bubble tracking algorithm

Experimental investigation on flow boiling bubble motion under ultrasonic field in vertical minichannel by using bubble tracking algorithm

Boundary Condition Effect on Two-Phase Fluid Flow ‎and Heat Transfer inside 3-D Microchannels

Flow and heat transfer for a two-phase slug flow in horizontal pipes: A mechanistic model

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