Heat transfer enhancement via bubble dynamics along an inclined wall

Khodadadi, Sajad; Taleghani, Mohammad Hassan; Ganji, D.D.; Gorji-Bandpy, M.

doi:10.1016/j.icheatmasstransfer.2023.106829

Cited by 11 publications

(3 citation statements)

References 47 publications

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“…Many researchers [33][34][35][36][37][38][39] have reported that colloidal solutions are stable at zeta potentials greater than 30 mV. This value for the nanofluid made at a concentration of 0.01% was −31 mV, which indicates the high stability of the nanofluid [40][41][42][43][44][45][46][47].…”

Section: Preparation Of Nanofluidmentioning

confidence: 98%

Experimental Investigation of the Effects of Grooves in Fe2O4/Water Nanofluid Pool Boiling

Rashid,

Ali,

Zorah

et al. 2024

Fluids

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In this study, we systematically explored how changing groove surfaces of iron oxide/water nanofluid could affect the pool boiling heat transfer. We aimed to investigate the effect of three types of grooves, namely rectangular, circular, and triangular, on the boiling heat transfer. The goal was to improve heat transfer performance by consciously changing surface structure. Comparative analyses were conducted with deionized water to provide valuable insights. Notably, the heat transfer coefficient (HTC) exhibited a significant increase in the presence of grooves. For deionized water, the HTC rose by 91.7% and 48.7% on circular and rectangular grooved surfaces, respectively. Surprisingly, the triangular-grooved surface showed a decrease of 32.9% in HTC compared to the flat surface. On the other hand, the performance of the nanofluid displayed intriguing trends. The HTC for the nanofluid diminished by 89.2% and 22.3% on rectangular and triangular grooved surfaces, while the circular-grooved surface exhibited a notable 41.2% increase in HTC. These results underscore the complex interplay between groove geometry, fluid properties, and heat transfer enhancement in nanofluid-based boiling. Hence, we thoroughly examine the underlying mechanisms and elements influencing these observed patterns in this research. The results provide important insights for further developments in this area by shedding light on how surface changes and groove geometry may greatly affect heat transfer in nanofluid-based pool boiling systems.

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Section: Preparation Of Nanofluidmentioning

confidence: 98%

Experimental Investigation of the Effects of Grooves in Fe2O4/Water Nanofluid Pool Boiling

Rashid,

Ali,

Zorah

et al. 2024

Fluids

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“…When the heat flux exceeds a certain value, a layer of vapor resulting from the joining of small bubbles and the production of a large overlying bubble covers the boiling surface and prevents heat exchange between the surface and the fluid (due to the lower heat transfer coefficient of vapor compared to water) [7,8]. In this case, the temperature jumps rapidly on the surface, and this can damage the boiling surface and the heater cartridge.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Heat Transfer in Pool Boiling to Investigate the Effect of Surface Roughness on Critical Heat Flux

Ali

2024

ChemEngineering

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Utilizing pool boiling as a cooling method holds significant importance within power plant industries due to its ability to effectively manage temperature differentials amidst high heat flux conditions. This study delves into the impact of surface modifications on the pool boiling process by conducting experiments on four distinct boiling surfaces under various conditions. An experimental setup tailored for this investigation is meticulously designed and implemented. The primary objective is to discern the optimal surface configuration capable of efficiently absorbing maximum heat flux while minimizing temperature differentials. In addition, this study scrutinizes bubble dynamics, pivotal in nucleation processes. Notably, surfaces polished unidirectionally (ROD), exhibiting lower roughness, demonstrate superior performance in critical heat flux (CHF) compared to surfaces with circular roughness (RCD). Moreover, the integration of bubble liquid separation methodology along with the introduction of a bubble micro-layer yields a microchannel surface. Remarkably, this modification results in a noteworthy enhancement of 131% in CHF and a substantial 211% increase in the heat transfer coefficient (HTC) without resorting to particle incorporation onto the surface. This indicates promising avenues for enhancing cooling efficiency through surface engineering without additional additives.

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“…Two-phase bubble flows have a wide range of applications in micro-to-macroscale phenomena across multiple industrial sectors. For instance, bubble dynamics can alter the heat transfer coefficients in different channel geometries [1]. In petroleum-industry and carbon-abatement technologies, gas-liquid slug flows can be controlled to improve the efficiency of carbon dioxide injection into deep geological formations, as well as pipeline flow assurance [2].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Gas Bubble Interaction in a Circular Cross-Section Channel in Shear Flow

Santos,

Oliveira,

Mangiavacchi

et al. 2024

Fluids

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This work’s goal is to numerically investigate the interactions between two gas bubbles in a fluid flow in a circular cross-section channel, both in the presence and in the absence of gravitational forces, with several Reynolds and Weber numbers. The first bubble is placed at the center of the channel, while the second is near the wall. Their positions are set in such a way that a dynamic interaction is expected to occur due to their velocity differences. A finite element numerical tool is utilized to solve the incompressible Navier–Stokes equations and simulate two-phase flow using an unfitted mesh to represent the fluid interface, akin to the front-tracking method. The results show that the velocity gradient influences bubble shapes near the wall. Moreover, lower viscosity and surface tension force account for more significant interactions, both in the bubble shape and in the trajectory. In this scenario, it can be observed that one bubble is trapped in the other’s wake, with the proximity possibly allowing the onset of coalescence. The results obtained contribute to a deeper understanding of two-phase inner flows.

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Heat transfer enhancement via bubble dynamics along an inclined wall

Cited by 11 publications

References 47 publications

Experimental Investigation of the Effects of Grooves in Fe2O4/Water Nanofluid Pool Boiling

Experimental Investigation of the Effects of Grooves in Fe2O4/Water Nanofluid Pool Boiling

An Experimental Study of Heat Transfer in Pool Boiling to Investigate the Effect of Surface Roughness on Critical Heat Flux

Numerical Investigation of Gas Bubble Interaction in a Circular Cross-Section Channel in Shear Flow

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