A Review of the Complex Flow and Heat Transfer Characteristics in Microchannels

Zhang, Junqiang; Zou, Zhengping; Fu, Chao

doi:10.3390/mi14071451

Cited by 6 publications

(2 citation statements)

References 227 publications

(330 reference statements)

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“…According to Fourier's law of heat conduction, the rate of heat transfer is directly proportional to the temperature difference. Therefore, this increased temperature difference permits more effective heat transfer and decreases thermal resistance [30]. Similarly, this large difference in temperature between the hot and cold fluids urges an increased heat transfer rate and heat transfer coefficient.…”

Section: Effect Of Process Parameters On Responses 331 Effect Of Heat...mentioning

confidence: 99%

Experimental investigation and optimization of heat pipe heat exchanger performance under two distinct heat transport mediums through TOPSIS approach

Sethuraman,

Muthuvelan,

Mahadevan

et al. 2024

Eng. Res. Express

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This paper presents a comprehensive thermal performance analysis of the heat pipe heat exchanger by varying the input process parameters and optimizing the best condition for waste heat recovery through the TOPSIS technique. In this work, the heat pipe is constructed with a copper tube and segmented into evaporator and condenser sections carrying hot and cold fluids with a half-fill ratio. The heat pipe is oriented in 0⁰ horizontally with the wick material made from stainless steel and works based on the capillary principle. The efficiency of the HPHE is evaluated by varying the input operational parameters, namely heat input, mass flow rate of hot fluid, inlet temperature of hot fluid, and mass flow rate of cold fluid, on response variables, specifically thermal resistance, energy balance ratio, universal heat transfer coefficient, and effectiveness. The experiment was designed for four factors at three levels as per Taguchi’s L27 orthogonal array, and the best optimising condition was determined by employing the multi-objective technique for order preference by similarity to ideal solution (TOPSIS) approach. The best input condition found was A3B1C1D3, in which the heat input was at 90 W, the mass flow rate of hot fluid was at 0.2 kg/min, the mass flow rate of cold fluid was at 0.1 kg/min, and the inlet temperature was at 60°C. The effect of process parameters and their significance on output responses was analysed by executing an analysis of variance (ANOVA) statistical method. The mathematical regression model was generated, and validation was made to investigate the prediction error percentage.

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Section: Effect Of Process Parameters On Responses 331 Effect Of Heat...mentioning

confidence: 99%

Experimental investigation and optimization of heat pipe heat exchanger performance under two distinct heat transport mediums through TOPSIS approach

Sethuraman,

Muthuvelan,

Mahadevan

et al. 2024

Eng. Res. Express

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“…The surface roughness has a profound impact on the nucleate boiling heat transfer behavior, including single-phase and two-phase convection and radiation [134]. Thus, enhancing the roughness of the heating surface by sandblasting, chemical etching, mechanical roughening, and induction of artificial surface cavities are commonly followed approaches for ameliorating nucleate pool boiling performance.…”

Section: Surface Rougheningmentioning

confidence: 99%

An Overview of the Recent Advances in Pool Boiling Enhancement Materials, Structrure, and Devices

Pereira,

Souza,

Lima

et al. 2024

Micromachines

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This review attempts to provide a comprehensive assessment of recent methodologies, structures, and devices for pool boiling heat transfer enhancement. Several enhancement approaches relating to the underlying fluid route and the capability to eliminate incipient boiling hysteresis, augment the nucleate boiling heat transfer coefficient, and improve the critical heat flux are assessed. Hence, this study addresses the most relevant issues related to active and passive enhancement techniques and compound enhancement schemes. Passive heat transfer enhancement techniques encompass multiscale surface modification of the heating surface, such as modification with nanoparticles, tunnels, grooves, porous coatings, and enhanced nanostructured surfaces. Also, there are already studies on the employment of a wide range of passive enhancement techniques, like displaced enhancement, swirl flow aids, and bi-thermally conductive surfaces. Moreover, the combined usage of two or more enhancement techniques, commonly known as compound enhancement approaches, is also addressed in this survey. Additionally, the present work highlights the existing scarcity of sufficiently large available databases for a given enhancement methodology regarding the influencing factors derived from the implementation of innovative thermal management systems for temperature-sensitive electronic and power devices, for instance, material, morphology, relative positioning and orientation of the boiling surface, and nucleate boiling heat transfer enhancement pattern and scale. Such scarcity means the available findings are not totally accurate and suitable for the design and implementation of new thermal management systems. The analysis of more than 100 studies in this field shows that all such improvement methodologies aim to enhance the nucleate boiling heat transfer parameters of the critical heat flux and nucleate heat transfer coefficient in pool boiling scenarios. Finally, diverse challenges and prospects for further studies are also pointed out, aimed at developing important in-depth knowledge of the underlying enhancement mechanisms of such techniques.

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