Cavitation characteristics of a small centrifugal pump in He I and He II

Ludtke, P. R.; Daney, David

doi:10.1016/0011-2275(88)90053-7

Cited by 16 publications

(4 citation statements)

References 2 publications

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“…33 Here, given the large distortions of the bilayer and pronounced water penetration observed by ND ( Figure 5B) for p1 at high peptide content, we decided to test whether toroidal pores existed in the ND samples. Water columns on the order of 15-25 Å in radii were found in samples containing magainin 2 21 and melittin 85 by in-plane ND, using H 2 O/ 2 H 2 O contrast variation. These water-filled cavities were assimilated to TM toroidal pores given the presence of bent monolayers.…”

Section: Nmr-monitored Titrations: Determination Of Peptide Charge Inmentioning

confidence: 96%

Structure and Function in Antimicrobial Piscidins: Histidine Position, Directionality of Membrane Insertion, and pH-Dependent Permeabilization

et al. 2019

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Piscidins are histidine-enriched antimicrobial peptides that interact with lipid bilayers as amphipathic α-helices. Their activity at acidic and basic pH in vivo makes them promising templates for biomedical applications. This study focuses on p1 and p3, both 22-residue-long piscidins with 68% sequence identity. They share three histidines (H3, H4 and H11) but p1, which is significantly more permeabilizing, has a fourth histidine (H17). This study investigates how variations in amphipathic character associated with histidines affect the permeabilization properties of p1 and p3. First, we show that the permeabilization ability of p3, but not p1, is strongly inhibited at pH 6.0 when the conserved histidines are partially charged and H17 is

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Section: Nmr-monitored Titrations: Determination Of Peptide Charge Inmentioning

confidence: 96%

Structure and Function in Antimicrobial Piscidins: Histidine Position, Directionality of Membrane Insertion, and pH-Dependent Permeabilization

et al. 2019

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“…Thereafter, in order to investigate a faster chocked flow with cavitation in LN 2 , LOX and LCH 4 , an experimental study using three different shape nozzles was carried out by Simoneau and Hendricks [6] in 1979, who made no effort to visualize the flow patterns. Several U.S. groups [8][9][10][11] reported on a subsonic flow of LHe, however measurements were only for pressure or mass flow rate, not elaborating flow visualization. There have been very few studies to visualize cryogenic cavitation, because of difficulty in the experiments.…”

Section: Nomenclaturementioning

confidence: 98%

Periodical shedding of cloud cavitation from a single hydrofoil in high-speed cryogenic channel flow

2009

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In order to explain criteria for periodical shedding of the cloud cavitation, flow patterns of cavitation around a plano-convex hydrofoil were observed using a cryogenic cavitation tunnel of a blowdown type. Two hydrofoils of similarity of 20 and 60 mm in chord length with two test sections of 20 and 60 mm in width were prepared.Working fluids were water at ambient temperature, hot water and liquid nitrogen. The parameter range was varied between 0.3 and 1.4 for cavitation number, 9 and 17 m/sec for inlet flow velocity, and −8° and 8° for the flow incidence angle, respectively. At incidence angle 8°, that is, the convex surface being suction surface, periodical shedding of the whole cloud cavitation was observed on the convex surface under the specific condition with cavitation number and inlet flow velocity, respectively, 0.5, 9 m/sec for liquid nitrogen at  192°C and 1.4, 11 m/sec for water at 88°C, whereas under the supercavitation condition, it was not observable. Periodical shedding of cloud cavitation occurs only in the case that there are both the adverse pressure gradient and the slow flow region on the hydrofoil.

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“…Walstrom [1] conducted pressure measurement in He II pump flow upon the occurrence of cavitation and the superheat. Daney [2][3][4] also experimentally investigated liquid helium flow through some kind of pumps and concluded that He I was insensitive to cavitation, but He II was highly susceptible to cavitation. The thermo-fluid characteristic of cavitating flow of liquid helium was numerically studied including the effect of superfluidity by Ishimoto [5].…”

Section: Introductionmentioning

confidence: 95%

PIV Analysis of Cavitation Flow Characteristics of He II

Harada¹,

Murakami²

2006

AIP Conference Proceedings

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In the present experimental study cavitation phenomena in both He I and He II flows were investigated through the application of the PIV technique and visual observation under the saturated vapor pressure condition. The cavitation flow was generated in the downstream regions of a Venturi channel and a converging jet nozzle driven by a contracting metal bellows. It is seen that cavitation inception is a kind of stochastic process and has definite temperature dependence. The spatial distribution of the cavitation bubble velocity is measured by using the PIV technique. Some differences in the cavitating flow pattern and the void fraction are found between He II and He I cavitating flows. The PIV result indicates that the void fraction for He II flow is larger than that for He I flow.

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Cavitation characteristics of a small centrifugal pump in He I and He II

Cited by 16 publications

References 2 publications

Structure and Function in Antimicrobial Piscidins: Histidine Position, Directionality of Membrane Insertion, and pH-Dependent Permeabilization

Structure and Function in Antimicrobial Piscidins: Histidine Position, Directionality of Membrane Insertion, and pH-Dependent Permeabilization

Periodical shedding of cloud cavitation from a single hydrofoil in high-speed cryogenic channel flow

PIV Analysis of Cavitation Flow Characteristics of He II

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