Vertically upward two-phase flow with a highly viscous liquid-phase in a nozzle and orifice plate

McNeil, David Archibald; Stuart, Alastair D.

doi:10.1016/j.ijheatfluidflow.2003.08.003

Cited by 11 publications

(7 citation statements)

References 15 publications

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“…Evaluation of for the intrinsic permeability values of metal foams (Table 1), and the compressibility and viscosity of mineral oil, k f = 1.5 GPa [11] and η f = 450 mPas [16], respectively, clearly shows that the pore pressure inside the tested titanium samples is built up within a small fraction of 1 s. This holds even for the intrinsic permeability values of bone (Table1) which are lower than the one for metal foams. Hence, during the mechanical experiments, lasting typically 10 min, the pore pressure is always quasi‐identical to the oil pressure built up in the pressure cell.…”

Section: Mechanical Testingmentioning

confidence: 99%

Acoustical and Poromechanical Characterisation of Titanium Scaffolds for Biomedical Applications

Müllner

Fritsch

Kohlhauser

et al. 2007

Strain

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Biocompatible materials are designed so as to mimic biological materials such as bone as closely as possible. As regards the mechanical aspect of bone replacement materials, a certain stiffness and strength are mandatory to effectively carry the loads imposed on the skeleton. In this paper, porous titanium with different porosities, produced on the basis of metal powder and space holder components, is investigated as bone replacement material. For the determination of mechanical properties, i.e. strength of dense and porous titanium samples, two kinds of experiments were performed – uniaxial and triaxial tests. The triaxial tests were of poromechanical nature, i.e. oil was employed to induce the same pressure both at the lateral surfaces of the cylindrical samples and inside the pores. The stiffness properties were revealed by acoustic (ultrasonic) tests. Different frequencies give access to different stiffness components (stiffness tensor components related to high‐frequency‐induced bulk waves versus Young's moduli related to low‐frequency‐induced bar waves), at different observation scales; namely, the observation scale the dense titanium with around 100 μm characteristic length (characterised through the high frequencies) versus that of the porous material with a few millimetres of characteristic length (characterised through the low frequencies). Finally, the experimental results were used to develop and validate a poro‐micromechanical model for porous titanium, which quantifies material stiffness and strength from its porosity and (in the case of the aforementioned triaxial tests) its pore pressurisation state.

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Section: Mechanical Testingmentioning

confidence: 99%

Acoustical and Poromechanical Characterisation of Titanium Scaffolds for Biomedical Applications

Müllner

Fritsch

Kohlhauser

et al. 2007

Strain

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“…Experiments allowed us to obtain mean film thickness and velocity inside the channel. It is shown that film velocity both for ethanol and dodecane increases from 0.2 m/s for Regas = 3.5⋅10 4 up to 0.8 m/s for Regas = 3.3⋅10 5 , where Reynolds number Regas is calculated by the critical diameter of the nozzle. Measured data for ethanol and dodecane film thickness are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Currently there are no complete studies with accurate and reliable data on the values of shearing stress on the gas-liquid interface under the condition of high relative velocities of gas flow. Existing experimental studies are focused on the measurement of flow integral characteristics and averaged parameters of waves without taking their non-stationary character into consideration [4,5].…”

Section: Introductionmentioning

confidence: 99%

Interphase interaction of near-wall liquid film with co-current gas flow inside a nozzle

et al. 2016

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The results of experimental study on high-velocity co-current gas flow interaction with near-wall liquid film are presented in the paper. Local parameters of near-wall liquid film are measured with the help of capacity-type probes. It is shown that co-current gas flow has strong influence on near-wall liquid film, leading to intensive wave formation, detachment of droplets from the film surface and their entrainment by the gas flow. A model for the film motion with co-current gas flow, linking together thickness and velocity of the film with value of shearing stress at gas-liquid boundary, is suggested.

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“…Royne 14 and Brignoni 15 analyzed the nozzle pressure drop caused by water and air through different nozzles, respectively, and found that nozzle diameter, length, and chamfer angle were crucial factors for nozzle pressure drop. McNeil 16 disclosed the influence of air with different viscosities and liquids on the nozzle pressure drop. In the hope of improving the performance of jet pumps, researchers have done extensive work from the perspectives of decreasing the pressure drop, analyzing the structure, and optimizing the evaluation methods such as aeration and mixing.…”

Section: Introductionmentioning

confidence: 99%

Research on the Law of Head Loss of Jet Pumps in the Cavitation State

Gan

Wang

et al. 2022

ACS Omega

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Liquid flow is subject to head loss because of viscous force, surface tension, friction force, and so on. Part of the energy is irreversibly converted into heat, which then dissipates into the environment. Head loss intensifies in the turbulent state. At present, few studies explore the law of head loss caused by secondary flow, cavitation intensity, and turbulence intensity. In this study, the head losses in different sections of a jet pump were studied by controlling the cavitation number σ, the secondary flow rate Q s , and the inlet pressure p i . The experimental results were analyzed with the aid of computational fluid dynamics. The results show that an increase in Q s can weaken the variations of Q s and suction pressure p s in the transitional stage of cavitation. Besides, σ, Q s , and p i influence head loss to varying extents. Cavitation intensity and turbulence intensity are the main factors for head loss and jet temperature difference. In particular, the influence of Q s on head loss provides guidance both for reducing the energy loss of the quantitative adding device and jet aerator and for expanding the stable adding range of the jet. More importantly, the main factors of energy loss caused by jet cavitation were analyzed in detail, which can effectively facilitate the pipeline design to reduce the local and frictional head loss.

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Vertically upward two-phase flow with a highly viscous liquid-phase in a nozzle and orifice plate

Cited by 11 publications

References 15 publications

Acoustical and Poromechanical Characterisation of Titanium Scaffolds for Biomedical Applications

Acoustical and Poromechanical Characterisation of Titanium Scaffolds for Biomedical Applications

Interphase interaction of near-wall liquid film with co-current gas flow inside a nozzle

Research on the Law of Head Loss of Jet Pumps in the Cavitation State

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