Oscillating Flow and Heat Transfer of Single Phase in Capillary Tubes

Ma, Hongbin

doi:10.1007/978-1-4939-2504-9_3

Oscillating Heat Pipes 2015

DOI: 10.1007/978-1-4939-2504-9_3

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Oscillating Flow and Heat Transfer of Single Phase in Capillary Tubes

Hongbin Ma

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Cited by 3 publications

References 24 publications

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Liquid Plug Motion Noninvasive Detecting in Opaque Microchannels via Grating Electrodes‐Based Liquid‐Solid Nanogenerator

Zhao,

Du,

Zou

et al. 2024

Adv Materials Technologies

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The precision in controlling fluid flow is crucial for the efficiency of microchannel devices. Consequently, it is essential to monitor the fluid within microchannels in real time. However, the microchannel flow's susceptibility to disturbance and small size present challenges in sensing. A Liquid‐Solid Triboelectric Nanogenerator (TENG) with grating electrodes is proposed for non‐invasive sensing of liquid plug movements in microchannels and is suitable for use with opaque channels. This sensor operates on the principle of initiating multiple pulse signals via grating electrodes. And analyze the motion of the liquid plug by the time difference between the signal peaks. It facilitates the measurement of liquid plug count, average speed, average acceleration, and the detection of flow direction. The liquid plug counters, and flow direction sensors yielded clear and distinguishable signals. The liquid plug average speed sensor achieves a 95% accuracy rate, and the acceleration sensor accurately distinguishes speed trends of the liquid plug with more than 85% precision. Grating electrodes are effectively employed for motion sensing. Analyzing the motion of an object by the time difference between voltage peaks offers greater stability than voltage magnitude analysis. Four portable prototypes are designed to make them applicable for fluid sensing in microchannel devices.

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Liquid Plug Motion Noninvasive Detecting in Opaque Microchannels via Grating Electrodes‐Based Liquid‐Solid Nanogenerator

Zhao,

Du,

Zou

et al. 2024

Adv Materials Technologies

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Assessment of heat transfer and flow characteristics of a two‐phase closed thermosiphon

Ahmed

Jubori

2020

Heat Trans

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In this study, comprehensive modeling and simulations were developed and carried out to perform the investigation of the thermal performance of the enclosed thermosiphon through pool boiling in the evaporator sector and the condensation of the liquid film in the condenser part. To simulate these phenomena, the volume of fluid model was utilized. The simulation modeling using the computational fluid dynamics (CFD) technique was validated with existing experimental results, and a good agreement was reached. The simulation results were presented and evaluated in terms of temperature profiles and contours, the volume of fraction contours, and velocity vector distribution. Moreover, the thermal performance (ie, the heat transfer coefficient and thermal resistance) through the thermosiphon operation was analyzed. From the simulation results, it is found that the thermosiphon performance can be improved by the tilt angle and fill ratio. The results indicated that the optimal performance (ie, a high heat transfer coefficient and a low thermal resistance) was attained at a power input of 250 W, tilt angle of 90°, and fill ratio of 0.5. The established CFD simulations effectively predicted the formation of two‐phase flow pattern and boiling and condensation zones with water at a low power input, termed as geyser boiling.

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Heat transfer from glass melt to cold cap: Computational fluid dynamics study of cavities beneath cold cap

Abboud

Guillen

Hrma

et al. 2021

Int J of Appl Glass Sci

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Efficient glass production depends on the continuous supply of heat from the glass melt to the floating layer of batch, or cold cap. Computational fluid dynamics (CFD) are employed to investigate the formation and behavior of gas cavities that form beneath the batch by gases released from the collapsing primary foam bubbles, ascending secondary bubbles, and in the case of forced bubbling, from the rising bubbling gas. The gas phase fraction, temperature, and velocity distributions below the cold cap are used to calculate local and average heat transfer rates as a function of the bubbling rate. It is shown that the thickness of the cavities is nearly independent of the cold cap shape and the amount of foam evolved during batch conversion. It is ~7 mm and up to ~15 mm for the cases without and with forced bubbling used to promote circulation within the melt, respectively. Using computed velocity and temperature profiles, the melting rate of the simulated high‐level nuclear waste glass batch was estimated to increase with the bubbling rate to the power of ~0.3 to 0.9, depending on the flow pattern. The simulation results are in good agreement with experimental data from laboratory‐ and pilot‐scale melter tests.

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Oscillating Flow and Heat Transfer of Single Phase in Capillary Tubes

Cited by 3 publications

References 24 publications

Liquid Plug Motion Noninvasive Detecting in Opaque Microchannels via Grating Electrodes‐Based Liquid‐Solid Nanogenerator

Liquid Plug Motion Noninvasive Detecting in Opaque Microchannels via Grating Electrodes‐Based Liquid‐Solid Nanogenerator

Assessment of heat transfer and flow characteristics of a two‐phase closed thermosiphon

Heat transfer from glass melt to cold cap: Computational fluid dynamics study of cavities beneath cold cap

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