Active control of flow boiling oscillation amplitude and frequency using a transverse jet in crossflow

Vutha, Ashwin Kumar; Rao, Sameer R.; Houshmand, Farzad; Peles, Yoav

doi:10.1063/1.4945334

Cited by 12 publications

(6 citation statements)

References 21 publications

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“…The surface micro/nano structure can be used in the micro-channel to increase the nucleate site density, promote the nucleation of bubbles at low wall superheat, and restrain boiling delay, thus not only eliminating the two-phase instability but also enhancing boiling heat transfer [18][19][20]. Some scholars have put forward some methods for active suppression of micro-channel flow boiling instability, such as increasing the inlet liquid pressure to prevent backflow [21], using subcooled liquid jet to prevent bubbles from growing [22,23], etc. However, the micro/nano structure is very complicated to prepare, and cannot be used for active control of instability and heat transfer process.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Heat Transfer Performance of Pump-assisted Capillary Phase-change Loop

Yang¹,

Wang²,

Zhang³

et al. 2021

Preprint

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To overcome the two-phase flow instability of traditional boiling heat dissipation technologies, a porous wick was used for liquid-vapor isolation, thus realizing efficient and stable boiling heat dissipation. A pump-assisted capillary phase-change loop with methanol as working medium was established to study the effect of liquid-vapor pressure difference and heating power on its start-up and steady-state characteristics. The results indicated that the evaporator undergoes four heat transfer modes including flooded, partial flooded, thin film evaporation and overheating. The thin film evaporation mode was the most efficient one with the shortest start-up period. Besides, the heat transfer modes were determined by liquid-vapor pressure difference and power. The heat transfer coefficient could be significantly improved and the thermal resistance could be reduced by increasing liquid-vapor pressure difference as long as it did not exceed 8 kPa. However, when the liquid-vapor pressure difference exceeded 8kPa, its influence on the heat transfer coefficient weakened. In addition, a two-dimensional heat transfer mode distribution diagram considering both liquid-vapor pressure difference and power was drawn through a great number of experiments. During engineering application, the liquid-vapor pressure difference can be controlled to maintain efficient thin film evaporation in order to achieve the optimum heat dissipation effect.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Heat Transfer Performance of Pump-assisted Capillary Phase-change Loop

Yang¹,

Wang²,

Zhang³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The surface micro/nanostructure can be used in the micro-channel to increase the nucleate site density, promote the nucleation of bubbles at low wall superheat, and restrain boiling delay, thus not only eliminating the two-phase instability but also enhancing boiling heat transfer [22][23][24]. Some scholars have put forward methods for active suppression of micro-channel flow boiling instability, such as increasing the inlet liquid pressure to prevent backflow [25], using a subcooled liquid jet to prevent bubbles from growing [26,27], etc. However, the micro/nanostructure is complicated to prepare and cannot be used for active control of instability and the heat transfer process.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Heat Transfer Performance of Pump-Assisted Capillary Phase-Change Loop

et al. 2021

View full text Add to dashboard Cite

To overcome the two-phase flow instability of traditional boiling heat dissipation technologies, a porous wick was used for liquid-vapor isolation, achieving efficient and stable boiling heat dissipation. A pump-assisted capillary phase-change loop with methanol as the working medium was established to study the effect of liquid-vapor pressure difference and heating power on its start-up and steady-state characteristics. The results indicated that the evaporator undergoes four heat transfer modes, including flooded, partially flooded, thin-film evaporation, and overheating. The thin-film evaporation mode was the most efficient with the shortest start-up period. In addition, heat transfer modes were determined by the liquid-vapor pressure difference and power. The heat transfer coefficient significantly improved and the thermal resistance was reduced by increasing liquid-vapor pressure as long as it did not exceed 8 kPa. However, when the liquid-vapor pressure exceeded 8 kPa, its influence on the heat transfer coefficient weakened. In addition, a two-dimensional heat transfer mode distribution diagram concerning both liquid-vapor pressure difference and power was drawn after a large number of experiments. During an engineering application, the liquid-vapor pressure difference can be controlled to maintain efficient thin-film evaporation in order to achieve the optimum heat dissipation effect.

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“…1,2 In order to overcome the drawbacks of the flow instability, recent studies show the efforts for controlling and suppressing the oscillations. [3][4][5] Two typical types of dynamic two-phase flow oscillations are density wave oscillations and pressure drop oscillations which are characterized by short and large period oscillations respectively. [6][7][8] Since the 60s research has been carried out for unveiling the physics of the process and developing suitable models for predicting and controlling the occurrence of such instabilities.…”

Section: Introductionmentioning

confidence: 99%

On the occurrence of superimposed density wave oscillations on pressure drop oscillations and the influence of a compressible volume

2018

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Although two-phase flow instabilities are attributed to be one of the impediments for achieving high heat flux in boiling systems, most of their fundamental characteristics remain uncharted. In particular, pressure drop oscillations and density wave oscillations are two types of dynamic two-phase flow instabilities that can cause large variations in pressure and temperature. Under particular working conditions, both oscillations have been observed to interact, resulting in long-period pressure drop oscillations with superimposed short-period density wave oscillations. However, in this situation, the amplitude of the density wave oscillations is typically larger than the corresponding to a pure density wave oscillation. Here, we show that a compressible volume in the system, essential for the occurrence of pressure drop oscillations, plays a major role in amplifying the amplitude of the superimposed density wave oscillations.

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Active control of flow boiling oscillation amplitude and frequency using a transverse jet in crossflow

Cited by 12 publications

References 21 publications

Experimental Study on the Heat Transfer Performance of Pump-assisted Capillary Phase-change Loop

Experimental Study on the Heat Transfer Performance of Pump-assisted Capillary Phase-change Loop

Experimental Study on the Heat Transfer Performance of Pump-Assisted Capillary Phase-Change Loop

On the occurrence of superimposed density wave oscillations on pressure drop oscillations and the influence of a compressible volume

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