Thermodynamic Effect on a Cavitating Inducer—Part II: On-Board Measurements of Temperature Depression Within Leading Edge Cavities

Franc, Jean-Pierre; Boitel, Guillaume; Riondet, Michel; Janson, Éric; Ramina, Pierre; Rebattet, Claude

doi:10.1115/1.4001007

Cited by 19 publications

(11 citation statements)

References 6 publications

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“…Thus, an increase of Jakob number corresponds to an increase of heat and vapour mass transfer rates. As already reported by [61] and [62], it is very interesting to note that Jakob number usually employed to study phase change in boiling flows corresponds in fact to the definition of the B-factor (Eq. 1) used for the study of cavitating flows with thermal effects.…”

mentioning

confidence: 73%

On numerical simulation of cavitating flows under thermal regime

Colombet

Silva

Patella

2017

International Journal of Heat and Mass Transfer

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International audienceIn this work, we investigate closure laws for the description of interfacial mass transfer in cavitating flowsunder thermal regime. In a first part, we show that, if bubble resident time in the low pressure area of theflow is larger than the inertial/thermal regime transition time, bubble expansion are no longer monitoredby Rayleigh equation, but by heat transfer in the liquid phase at bubbles surfaces. The modelling of inter-facial heat transfer depends thus on a Nusselt number that is a function of the Jakob number and of thebubble thermal Péclet number. This original approach has the advantage to include the kinetic of phasechange in the description of cavitating flow and thus to link interfacial heat flux to interfacial mass fluxduring vapour production. The behaviour of such a model is evaluated for the case of inviscid cavitatingflow in expansion tubes for water and refrigerant R114 using a four equations mixture model. Comparedwith inertial regime (Rayleigh equation), results obtained considering thermal regime seem to predictlower local gas volume fraction maxima as well as lower gradients of velocity and gas volume fraction.It is observed that global vapour production is closely monitored by volumetric interfacial area (bubblesize and gas volume fraction) and mainly by the Jakob number variations. It is found that, in contrast withphase change occurring in common boiling flow, Jakob number variation is influenced by phasic temper-ature difference but also by density ratio variation with pressure and temperature

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mentioning

confidence: 73%

On numerical simulation of cavitating flows under thermal regime

Colombet

Silva

Patella

2017

International Journal of Heat and Mass Transfer

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“…These properties of the liquids result in a strong thermodynamic effect of cavitation, which cannot be neglected in modeling or analyzing the cavitation phenomena. In order to understand the differences between cavitation in the liquids mentioned above and in water at room temperature, studies have been carried out from the perspective of the thermodynamic effect, using the cavitation number as the control parameter [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55].…”

Section: Introductionmentioning

confidence: 99%

“…And from the Rayleigh-Plesset equation, governing the dynamics of a spherical bubble in an extended liquid, Brennen [40] defined a thermal parameter  , which depends only on the fluid temperature and the physical properties of the liquid. Franc et al [41][42][43] rearranged and non-dimensionalized Brennen's equation, using the dependency of a travelling bubble on the flow velocity and a spatial parameter to replace the time dependency of the thermal term of the Rayleigh equation. For scaling of sheet/cloud cavitation at geometric similar profiles of inducers, hydrofoils and Venturies, they proposed, based on their non-dimensional equation, to use the cavitation number for operating at similar conditions of phase transition, and the dimensionless *  for scaling of the thermodynamic effect on cavity clouds.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic effects on Venturi cavitation characteristics

Zhang

Zuo

Mørch³

et al. 2019

Physics of Fluids

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In this paper the thermodynamic effect is systematically studied by Venturi cavitation in a blow-down type tunnel for the first time, using water at temperatures up to relatively high levels, and at controlled dissolved gas contents in the supply reservoir (measured by dissolved oxygen, DO). The mean attached cavity length cav L   is chosen to reveal the thermodynamic effect, and the cavitation characteristics are analyzed from the experiments. With an increase of the thermodynamic parameter *  , a decrease of cav L   vs. the pressure recovery number κ is observed, which is consistent with suppression of cavitation by the thermodynamic effect, but the decrease is related not only to this effect. Based on the experimental results, a model is presented of the attached cavity cloud that develops from the Venturi throat. It is found that either the length of this cloud oscillates stably around a mean value, or the cloud breaks regularly at some upstream position, allowing that a detached cavity cloud is shed, flows downstream and collapses, while the remaining attached cloud regenerates. Applying this model to experimental results obtained first with cold water, then with hot water, we find that when the mean length of the attached cavity cloud oscillates stably, temperature increase causes reduction of the mean cavitation length. This is interpreted to be a consequence of the thermodynamic effect. When detachment of large cavity clouds occurs, the mean length is increased at temperature increase. This is a consequence of cloud configuration changes being superposed on changes due to the thermodynamic effect. These observations explain conflicting results reported for attached cavity clouds in relation to the thermodynamic effect. The gas content in the water is found to be without significance within the range of dissolved oxygen tested.

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“…This effect is required to be take into account in cavitation in cryogenic liquids, refrigerant and high temperature water, where the working temperature is close to the critical point temperature of the liquids. In order to investigate the influence of the thermodynamic effect, cavitation experiments have been carried out using the above mentioned liquids [3][4][5][6][7][8][9]. In contrast to the theoretical inference, a number of experimental studies found that a stronger thermodynamic effect enhances the degree of the sheet/cloud cavitation in some cases, e.g.…”

Section: Introductionmentioning

confidence: 99%

Influence of Dissolved Gas Content on Venturi Cavitation at Thermally Sensitive Conditions

Zhang¹,

Liu²

2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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Influence of dissolved gas content (measured by dissolved oxygen, DO) on Venturi cavitation (10mmscale test section) in water at different temperature, i.e., different degree of thermal sensitivity, is investigated in a blowdown-type cavitation tunnel. Investigations on the cavitation length and the unsteady cavitation behavior are presented. It is shown that the cavitation length decreases with increasing temperature (or the degree of the thermodynamic effect). In addition, the DO content has little influence on the mean cavitation length at thermally sensitive conditions.

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Thermodynamic Effect on a Cavitating Inducer—Part II: On-Board Measurements of Temperature Depression Within Leading Edge Cavities

Cited by 19 publications

References 6 publications

On numerical simulation of cavitating flows under thermal regime

On numerical simulation of cavitating flows under thermal regime

Thermodynamic effects on Venturi cavitation characteristics

Influence of Dissolved Gas Content on Venturi Cavitation at Thermally Sensitive Conditions

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