Recent advances in condensation heat transfer in mini and micro channels: A comprehensive review

Kadi, Khadije El; Alnaimat, Fadi; Sherif, S. A.

doi:10.1016/j.applthermaleng.2021.117412

Cited by 33 publications

(7 citation statements)

References 152 publications

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“…Adiabatic studies were conducted to elucidate fundamental flow characteristics at the micro-and mini-scale, involving the observation and mapping of flow regimes and the assessment of associated frictional pressure drop across the microchannel. However, there has been a notable increase in recent experiments focusing on condensing flows under non-adiabatic conditions in small-diameter channels compared to adiabatic two-phase flows [50]. These studies aim to examine the influence of various factors, such as operating conditions, channel geometry, surface characteristics, enhanced surface structures, and refrigerant type, on condensation flow regimes, heat transfer coefficients, and pressure drop, as discussed in this section.…”

Section: Experimental Studies Focused On Mini/microchannel Condensati...mentioning

confidence: 99%

Condensation Flow of Refrigerants Inside Mini and Microchannels: A Review

Başaran,

Benim

2024

Applied Sciences

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Nowadays, the demand for obtaining high heat flux values in small volumes has increased with the development of technology. Condensing flow inside mini- and microchannels has been becoming a promising solution for refrigeration, HVAC, air-conditioning, heat pumps, heat pipes, and electronic cooling applications. In these applications, employing mini/microchannels in the condenser design results in the working fluid, generally refrigerant, undergoing a phase change inside the mini/microchannels. On the other hand, the reduction in the hydraulic diameter during condensation gives rise to different flow regimes and heat transfer mechanisms in the mini- and microchannels compared to the conventional channels. Therefore, the understanding of fluid flow and heat transfer characteristics during condensation of refrigerant inside mini- and microchannels has been gaining importance in terms of condenser design. This study presents a state-of-the-art review of condensation studies on refrigerants inside mini- and microchannels. The review includes experimental studies as well as correlation models, which are developed to predict condensation heat transfer coefficients and pressure drop. The refrigerant type, thermodynamical performance, and compatibility, as well as the environmental effects of refrigerant, play a decisive role in the design of refrigeration systems. Therefore, the environmental impacts of refrigerants and current regulations against them are also discussed in the present review.

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Section: Experimental Studies Focused On Mini/microchannel Condensati...mentioning

confidence: 99%

Condensation Flow of Refrigerants Inside Mini and Microchannels: A Review

Başaran,

Benim

2024

Applied Sciences

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“…The profound importance of the phase change phenomenon has ignited intense research endeavors aimed at optimizing operation processes, which are mainly based on trial-and-error experiments. , However, studying the combined impacts of hydrodynamic, thermodynamic, and even chemical dynamics in phase change processes is challenging, expansive, or even unsafe when using experimental techniques . Numerical modeling based on computational fluid dynamics (CFD) is increasingly applied to gain a better understanding of the complex transfer and reaction behaviors of multiphase flow with phase change .…”

Section: Introductionmentioning

confidence: 99%

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

Zhu

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Phase change is a phenomenon that has been extensively utilized in chemical engineering, energy, electronics, vehicle, and space exploration. From both the science and engineering perspectives, gaining a profound understanding of the intricacies of multiphase flow processes accompanied by heat and mass transfer due to phase change is of fundamental importance. Indeed, the computational fluid dynamics (CFD) has been increasingly applied as an effective tool to give an in-depth and efficient analysis of the phase change processes, thereby enhancing our understanding and capacity to control and optimize the phase change effects in these processes. This paper seeks to provide a comprehensive review of the utilization of CFD methodologies in the simulations of phase change flows across various applications, including temperature management, drying, separation and purification, and others. First, the CFD models at various scales that are developed to elucidate the phase change processes are summarized. Second, the noteworthy advances in the recent CFD simulation work on various phase change processes are presented, respectively. Finally, the challenges and potential prospects to facilitate the application of the phase change flow are discussed. The current review aims to offer insightful guidance for the CFD modeling of phase change processes in numerous engineering application scenarios.

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“…The carboxymethyl cellulose (CMC) is used as outer layer of fertilizer coating since this material has no negative impacts on the environment. Such a study has not been investigated extensively, despite several research reported on the flow patterns [11].…”

Section: Introductionmentioning

confidence: 99%

Modelling of Co-Axial and Tri-Axial Milli-Fluidic Devices for Co-Extrusion of Semi-Solid Solids

Al-Sharai

Soon

See

et al. 2023

AEJ

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With the use of a milli-fluidics device, it is possible to manipulate small amounts of fluid in the millimeter range with pinpoint accuracy. The milli-fluidics are currently lacking in studies of the relationship between fluid viscosity, output velocity and output pressure. Thus, this study examines the effects of viscosity on fluid dynamics in the co-axial and tri-axial milli-fluidics. This geometry of the co-axial and tri-axial milli-fluidics consist of single outlet, two inlets and three inlets, respectively. The tri-axial milli-fluidics is 46 mm long and 11.31 mm wide, while, the coaxial milli-fluidic is 64.73 mm long and 9.2 mm wide. The co-axial milli-fluidics constituted of 775 domain elements and 147 boundary elements, while, the tri-axial milli-fluidics mesh constituted of 1518 domain elements and 178 boundary elements. Laminar flow was observed for the flow of the materials through the channels. When the dynamic viscosity approaches 5 mPa.s, the simulation reveals that the flow rate is inversely proportional to the dynamic viscosity for co-axial milli-fluidics. It was difficult to combine fluids with different viscosities with small volume of water in a narrow boundary, thus the parallel flow of material was observed. When using the one outlet channel for the tri-axial milli-fluidics, the assemble pressure at the three inlets was decreased compared with co-axial milli-fluidic. Even when the dynamic velocity of the fluid at outlet 1 increased, its velocity remained consistent. An extruder using tri-axial milli-fluidics can be used if the interfacial tension for intake 1 is higher than for inlet 2 and the dynamic viscosity of fluid 1 is above 2 mPas, according to the volumetric fraction model. The tri-axial milli-fluidic was found to be suitable for producing cladding of material with the balanced pressure from the two side channels.

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Recent advances in condensation heat transfer in mini and micro channels: A comprehensive review

Cited by 33 publications

References 152 publications

Condensation Flow of Refrigerants Inside Mini and Microchannels: A Review

Condensation Flow of Refrigerants Inside Mini and Microchannels: A Review

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

Modelling of Co-Axial and Tri-Axial Milli-Fluidic Devices for Co-Extrusion of Semi-Solid Solids

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