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Dynamics of Bubbles in a Spherical Cluster under Increasing Liquid Pressure 液体压力增大时球形簇中气泡的动态变化
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-21 DOI: 10.1134/s0018151x23050103
R. I. Nigmatulin, A. A. Aganin, I. A. Aganin, A. I. Davletshin
{"title":"Dynamics of Bubbles in a Spherical Cluster under Increasing Liquid Pressure","authors":"R. I. Nigmatulin, A. A. Aganin, I. A. Aganin, A. I. Davletshin","doi":"10.1134/s0018151x23050103","DOIUrl":"https://doi.org/10.1134/s0018151x23050103","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The response of gas (air) bubbles in a spherical cluster to an increase in the pressure of the surrounding liquid (water) is considered. Consideration is carried out only until a bubble in the cluster disintegrates or collides with another bubble. The influence of the amplitude of the increase in the liquid pressure, as well as the position of the bubbles in the cluster and the interaction between the bubbles, is studied. The centers of the cluster bubbles are located at the nodes of a cubic grid, one of which is in the center of the cluster. The effect of the interaction of bubbles is assessed by comparison with the response of a single bubble. The cluster consists of 123 bubbles, the liquid pressure is 1 bar. Initially, the bubbles are spherical with a radius of 0.1 mm, the cluster radius is about 3 mm. A discrete model is used, in which, together with the radial oscilations of bubbles, their movements in the liquid and their small deformations are also modeled. It is established that the maximum pressure in the bubbles, reached before the destruction or collision of any of them, is realized when the liquid pressure increases by 10 bar and turns out to be approximately 6500 times greater than their initial pressure and approximately 30 times greater than the response of a single bubble.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140203245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Heat Transfer Enhancement and Interaction of Rivulets on the Surface of a Heated Liquid Film 加热液体薄膜表面的热传导增强和细流的相互作用
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-20 DOI: 10.1134/s0018151x2303015x
E. A. Chinnov
{"title":"Heat Transfer Enhancement and Interaction of Rivulets on the Surface of a Heated Liquid Film","authors":"E. A. Chinnov","doi":"10.1134/s0018151x2303015x","DOIUrl":"https://doi.org/10.1134/s0018151x2303015x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The flow of an aqueous film along a vertical heater was studied for Reynolds numbers of 33, 50, and 105 and initial temperatures <i>T</i><sub>0</sub> = 15, 23, 30, and 40°С. It was shown that the amplitudes of the zigzag motion of the rivulets increased with increasing heat flux density. The most intensive growth of amplitudes was observed with the development of thermocapillary instability in the upper part of the heater. For high heat fluxes, when the amplitude of the zigzag motion reached a sufficiently large value, interaction of the rivulets began. Several types of interaction of rivulets on the surface of the heated liquid film were distinguished. It was shown that the appearance of a thermocapillary structure in the upper part of the heater led to movement of rivulets and an increase in the heat transfer intensity.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140883012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Estimation of Convective Heat Fluxes for Meteoroid Bodies in a Three-Dimensional Formulation 流星体对流热通量的三维估算公式
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-20 DOI: 10.1134/s0018151x23040090
D. N. Minyushkin, I. S. Frolov
{"title":"Estimation of Convective Heat Fluxes for Meteoroid Bodies in a Three-Dimensional Formulation","authors":"D. N. Minyushkin, I. S. Frolov","doi":"10.1134/s0018151x23040090","DOIUrl":"https://doi.org/10.1134/s0018151x23040090","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This paper proposes a modified effective length method for calculating heat fluxes in complex geometries in a three-dimensional formulation when moving in the atmosphere at high speeds and describes its software implementation. The method, on the one hand, does not require huge computational costs to obtain results, and on the other, demonstrates stable operation in complex geometries.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of Laser Microdisection of the Zona Pellucida of Embryos on the Its Thinning Dynamics under Cryopreservation Protocols 胚胎透明带激光显微切割对冷冻保存方案下胚胎透明带变薄动态的影响
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-20 DOI: 10.1134/s0018151x23040144
D. S. Sitnikov, D. E. Mukhdina, D. S. Korshunova, Yu. Yu. Silaeva, M. A. Filatov, I. V. Ilina
{"title":"Influence of Laser Microdisection of the Zona Pellucida of Embryos on the Its Thinning Dynamics under Cryopreservation Protocols","authors":"D. S. Sitnikov, D. E. Mukhdina, D. S. Korshunova, Yu. Yu. Silaeva, M. A. Filatov, I. V. Ilina","doi":"10.1134/s0018151x23040144","DOIUrl":"https://doi.org/10.1134/s0018151x23040144","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The authors studied the dynamics of thinning of the <i>zona pellucida</i> (ZP) in mouse embryo as a result of laser-assisted hatching performed at the blastocyst stage. Mouse embryos previously subjected to a freeze–thaw cycle (cryo-embryos) were selected as model embryos. For ZP microsurgery, femtosecond laser pulses were used (radiation wavelength 512 nm, pulse duration 100 fs, intensity 2.5 TW/cm<sup>2</sup>). The thickness of the ZP was measured before microsurgery at the blastocyst stage (~E3.5, i.e., 3.5 days of embryonic development) and at the hatching stage (~E5). It was found that the ZP of control group embryos (cryo-embryos not subjected to laser exposure) thinned more strongly (from 6.6 (E3.5) to 4.9 µm (E5)) compared to experimental embryos after the laser-assisted hatching procedure (from 7.1 ( E3.5) to 6.4 µm (E5)). In both the first and second cases, changes in ZP thickness were statistically significant. The results were compared with data for “fresh” embryos not subjected to cryopreservation. There was no pronounced effect of ZP hardening in cryo-embryos compared to fresh embryos. The use of the laser-assisted hatching procedure for cryo-embryos made it possible to increase the probability of successful hatching compared to embryos in the control group from 38.5 to 52.5%.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140889833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental Study of the Heat Transfer at Compressible Gas Flow with a Favorable Pressure Gradient 有利压力梯度的可压缩气体流动传热实验研究
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-20 DOI: 10.1134/s0018151x23040065
N. A. Kiselev, N. S. Malastovskii, A. G. Zditovets, Yu. A. Vinogradov
{"title":"Experimental Study of the Heat Transfer at Compressible Gas Flow with a Favorable Pressure Gradient","authors":"N. A. Kiselev, N. S. Malastovskii, A. G. Zditovets, Yu. A. Vinogradov","doi":"10.1134/s0018151x23040065","DOIUrl":"https://doi.org/10.1134/s0018151x23040065","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The parameters of heat transfer at compressible gas flow with a favorable pressure gradient have been experimentally studied. The heat transfer coefficients and the temperature of thermally insulated (adiabatic) wall are determined using the transient heat transfer method. To estimate the degree of flow laminarization, the results obtained are compared with the known dependences for the turbulent boundary layer developing on a plate in a zero-pressure gradient flow. Some regularities of the effect of flow acceleration on the heat transfer law are revealed for the studied configurations of supersonic nozzles.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Boiling Modes of Helium II on a Cylindrical Heater Inside a Porous Structure 多孔结构内圆柱形加热器上氦气 II 的沸腾模式
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-20 DOI: 10.1134/s0018151x23030185
Yu. Yu. Puzina, A. P. Kryukov
{"title":"Boiling Modes of Helium II on a Cylindrical Heater Inside a Porous Structure","authors":"Yu. Yu. Puzina, A. P. Kryukov","doi":"10.1134/s0018151x23030185","DOIUrl":"https://doi.org/10.1134/s0018151x23030185","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Experimental data on the study of boiling of superfluid helium (helium II) on a cylindrical heater inside a porous structure are considered. Based on an analysis of video recordings, the heat and mass transfer modes characterized by significant modification of the shape of the phase interface are classified. The values of heat fluxes and heater temperatures are presented, and the degree of nonequilibrium of the corresponding transfer processes is assessed.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Explosive Boiling-up of Superheated Gas-Saturated Alkanes 过热气体饱和烷烃的爆炸性沸腾
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-20 DOI: 10.1134/s0018151x23040028
V. G. Baidakov, A. M. Kaverin, A. S. Pankov
{"title":"Explosive Boiling-up of Superheated Gas-Saturated Alkanes","authors":"V. G. Baidakov, A. M. Kaverin, A. S. Pankov","doi":"10.1134/s0018151x23040028","DOIUrl":"https://doi.org/10.1134/s0018151x23040028","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The spontaneous boiling-up kinetics of liquid alkanes (methane, ethane, and propane) saturated with one of the following gases: helium, hydrogen, nitrogen, or methane is studied. The solution nucleation rate temperature, baric, and concentration dependences in the interval (10<sup>4</sup>–10<sup>8</sup>) m<sup>–3</sup> s<sup>–1</sup> are determined using the mean lifetime method. The measurements were carried out at pressures of 1–2 MPa and volatile component concentrations up to 6 mol %. The experimental results are compared with the classical nucleation theory in a macroscopic approximation. In contrast to pure liquid and liquid saturated with helium or hydrogen, the attainable superheating temperatures of solutions containing nitrogen or methane as a dissolved substance exceed their theoretically predicted values. The factors causing this mismatch are discussed.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140883115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modes of a Liquid Film Falling Down a Vertical Cylinder at Different Contact Angles 不同接触角下垂直圆柱体液膜的下落模式
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-20 DOI: 10.1134/s0018151x23030173
A. Yu. Sakhnov, O. A. Volodin, N. I. Pecherkin, A. N. Pavlenko
{"title":"Modes of a Liquid Film Falling Down a Vertical Cylinder at Different Contact Angles","authors":"A. Yu. Sakhnov, O. A. Volodin, N. I. Pecherkin, A. N. Pavlenko","doi":"10.1134/s0018151x23030173","DOIUrl":"https://doi.org/10.1134/s0018151x23030173","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We present the results of a three-dimensional numerical simulation of the dynamics of a falling film of a mixture of refrigerants, 0.9 mol fraction R21 + R114, considering the liquid flow along the outer lateral surface of a round vertical cylinder for a Reynolds number of 104 and contact angles of 10°, 30°, 50°, 70°, and 90°. The simulation was carried out using the volume of fluid (VOF) method in the OpenFOAM software. The contact angle has a significant effect on the area of the wetted surface due to a change in the modes of liquid falling down the cylinder. The following flow modes are identified: continuous film, stable jet mode, cascade jet mode, and massive jet mode. These modes are similar to the modes of fluid flow on horizontal tubes.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140883011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of the Moment of High Frequency Corona Discharge Initiation on the Combustion Development in a Hybrid Compression Engine 高频电晕放电起始时刻对混合压缩式发动机燃烧发展的影响
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23030082
E. A. Filimonova, A. S. Dobrovolskaya
{"title":"Influence of the Moment of High Frequency Corona Discharge Initiation on the Combustion Development in a Hybrid Compression Engine","authors":"E. A. Filimonova, A. S. Dobrovolskaya","doi":"10.1134/s0018151x23030082","DOIUrl":"https://doi.org/10.1134/s0018151x23030082","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The work shows the dependence of the moment of the discharge-activated zone ignition and the moment of self-ignition of the fuel mixture in the region ahead of the combustion wave front on two parameters: the crankshaft rotation angle at which the discharge was initiated and the specific energy input into the streamer channel. It is shown the necessity to take into account the change in pressure in the cylinder due to the movement of the piston in order to more accurately determine the optimal ignition limits of the activated zone and the occurrence of self-ignition. When modeling, the inhomogeneous formation of chemically active particles associated with the streamer and multi-pulse nature of the discharge was taken into account.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Processes Occurring in a Coolant Spray Cone 冷却剂喷锥中发生的过程
IF 1 4区 物理与天体物理
High Temperature Pub Date : 2024-03-12 DOI: 10.1134/s0018151x23020104
A. T. Komov, A. V. Zakharenkov, V. V. Tolmachev, V. S. Shteling
{"title":"Processes Occurring in a Coolant Spray Cone","authors":"A. T. Komov, A. V. Zakharenkov, V. V. Tolmachev, V. S. Shteling","doi":"10.1134/s0018151x23020104","DOIUrl":"https://doi.org/10.1134/s0018151x23020104","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The study considers generation of a dispersed coolant flow; the size distribution of droplets in the flow depending on the flow rate, pressure, and thermophysical properties of the coolant; the breakup and coagulation of droplets; and droplet size ranges resistant to breakup. A computer code for calculating the evolution of the spray cone parameters was developed based on the momentum equation and distribution of droplets along the radius in the flow at the atomizer nozzle.</p>","PeriodicalId":13163,"journal":{"name":"High Temperature","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140125017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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