Journal of Engineering Thermophysics最新文献_第6页

Some Ways to Redistribute the Liquid Irrigating the Structured Packing in a Distillation Column 精馏塔结构填料中液体再分配的几种方法

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700067

I. I. Gogonin

引用次数: 0

Heat Capacity of Magnesium–Lithium Alloys with 5–17 at % Li 含5-17 % Li的镁锂合金的热容量

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700134

D. A. Samoshkin, R. N. Abdullaev, A. Sh. Agazhanov, S. V. Stankus

{"title":"Heat Capacity of Magnesium–Lithium Alloys with 5–17 at % Li","authors":"D. A. Samoshkin, R. N. Abdullaev, A. Sh. Agazhanov, S. V. Stankus","doi":"10.1134/S1810232825700134","DOIUrl":"10.1134/S1810232825700134","url":null,"abstract":"In the present study, the specific heat capacity of solid magnesium–lithium alloys with composition of 5, 10, and 17 at % lithium in the temperature range of 185 to 755–780 K was measured for the first time. Measurements were performed by the method of differential scanning calorimetry using a DSC 404 F1 apparatus. The estimated uncertainty of the data obtained was 2–3%. The temperature dependences were developed and the table of recommended values on their basis were presented for use in various scientific and practical tasks. It has been established that the specific molar heat capacity data of the magnesium–lithium alloys containing 5–17 at % lithium practically coincide with each other over a wide temperature range and can be estimated within the measurement uncertainty limits using the heat capacity temperature dependence of solid magnesium. It is possible to estimate the heat capacity of the studied alloys (with an accuracy not exceeding the measurement uncertainty) up to the melting point of lithium (456 K) using the Neumann–Kopp rule; however, such an estimation can be carried out in a much narrower temperature range than the previous one.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"473 - 479"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of Thermal Radiation on Blood Flow Temperature Dynamics in a Constricted Artery System with Multi Slips Conditions 热辐射对多滑移收缩动脉系统血流温度动力学的影响

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700031

Prathi Vijaya Kumar, Shaik Mohammed Ibrahim, Kanithi Jyothsna, Gurram Dharmaiah, Giulio Lorenzini

{"title":"Impact of Thermal Radiation on Blood Flow Temperature Dynamics in a Constricted Artery System with Multi Slips Conditions","authors":"Prathi Vijaya Kumar, Shaik Mohammed Ibrahim, Kanithi Jyothsna, Gurram Dharmaiah, Giulio Lorenzini","doi":"10.1134/S1810232825700031","DOIUrl":"10.1134/S1810232825700031","url":null,"abstract":"This theoretical work employs biomedical engineering and fluid mechanics to examine blood flow dynamics in a thin, elongated artery subjected to a magnetic field and featuring porous walls. It explores the impact of linear, quadratic, and nonlinear radiations on blood flow. It also addresses the consequences of slip factors. By employing appropriate similarity transformations, the sets of partial differential equations governing the system are transformed into a set of ordinary differential equations. These are then solved utilizing the NDSolve technique in MATHEMATICA. This research offers a tangible explanation for simulating and analyzing distinct flow properties, like velocity, temperature, concentration, and microorganism motile density fields. The results demonstrate that quadratic thermal radiation produces elevated temperature levels inside blood flow compared to linear and nonlinear radiations. Bumped thermal slip establishes a lower temperature pattern in blood flow, indicating less heat exchange between the blood and the arterial wall. The Nusselt number rises in each instance with the associated rise in the unsteady parameter values. The findings corroborate the conclusions of prior studies.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"580 - 600"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measuring Concentration of Components in Droplets of Binary Solutions by the Capacitance Method 电容法测定二元溶液液滴中组分浓度

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700092

N. E. Shishkin, A. D. Nazarov, S. S. Sazhin

{"title":"Measuring Concentration of Components in Droplets of Binary Solutions by the Capacitance Method","authors":"N. E. Shishkin, A. D. Nazarov, S. S. Sazhin","doi":"10.1134/S1810232825700092","DOIUrl":"10.1134/S1810232825700092","url":null,"abstract":"Studying the patterns of changes in the concentration of components in droplets of binary solutions is critically important for optimization of processes in various industries, including chemistry, pharmaceuticals, and materials science; in designing various types of engines; and in evaporative cooling systems with complex compositions of reacting sprays. This article presents the results of an experimental study of the dynamics of volatile component escape from pendant droplets of aqueous solutions of ethanol, methanol, and acetone in an air flow. The concentration measurements were performed by the capacitance method. The method is based on the dependence of the probe capacitance on the solution permittivity, which is an additive value of the dielectric permittivities of the liquids constituting the solution, the change in the droplet volume during its evaporation taken into account. It is shown that, with an acceptable measurement error, the capacitance method can be used for determination of the concentration of components in a binary mixture droplet with diameter ranging from 1.5 to 3 mm. The experiments have shown that, at identical parameters of the flow around the droplet, the time of complete evaporation of the volatile component was determined by its initial content; the patterns of concentration change in aqueous solutions of acetone, methanol, and ethanol are the same, and, under equal external conditions, are described by a second-order curve. It has been shown that experimental data obtained at different air flow velocities can be generalized through the homochronicity criterion. For a more complete generalization of the experiments, it is necessary to present them in dependence on a complex that includes both the parameters of the ambient medium and the physical properties of liquids under study.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 3","pages":"487 - 498"},"PeriodicalIF":1.4,"publicationDate":"2025-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145420600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flash Boiling of Water at Discharge through a Short Oval Nozzle 通过短椭圆形喷嘴使水在排出时闪沸

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-11-02 DOI: 10.1134/S1810232825700055

K. A. Busov, N. A. Mazheiko, V. A. Shurupov

引用次数: 0

Boiling-Up of Two Jets of Superheated Water 两股过热水的沸腾

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-10-16 DOI: 10.1134/S1810232825020080

K. A. Busov

引用次数: 0

Hydrodynamics and Heat and Mass Transfer during Condensation of Moving Vapor on Bundles of Smooth Horizontal Tubes: A Brief Review 流动蒸汽在光滑水平管束上凝结过程中的流体力学和传热传质：综述

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-10-16 DOI: 10.1134/S1810232825020110

I. I. Gogonin, O. A. Volodin

引用次数: 0

Effect of Interference of Impinging Round Jets on the Cooling Intensity of Heat Transfer Surfaces 碰撞圆形射流干涉对换热表面冷却强度的影响

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-10-16 DOI: 10.1134/S1810232825020031

M. V. Philippov, I. A. Chokhar, V. V. Terekhov, A. I. Fedorchenko, V. I. Terekhov

{"title":"Effect of Interference of Impinging Round Jets on the Cooling Intensity of Heat Transfer Surfaces","authors":"M. V. Philippov, I. A. Chokhar, V. V. Terekhov, A. I. Fedorchenko, V. I. Terekhov","doi":"10.1134/S1810232825020031","DOIUrl":"10.1134/S1810232825020031","url":null,"abstract":"Impinging round parallel jets are one of the simplest and most\u0000efficient tools of heat and mass transfer enhancement and they are\u0000applied in cooling electronic equipment, gas turbine blades,\u0000combustion chamber walls, etc. As a rule, these devices use a\u0000system of jets. One of the simple ways to study the interaction of\u0000a jet array is to study the interaction between two jets. However,\u0000even with this approach, there are a large number of parameters\u0000that affect the process of jet interaction: the distance between\u0000the jets, the ratio of diameters, the ratio of flow rates, etc.,\u0000and this greatly complicates the description of characteristics of\u0000the interaction of turbulent jets with each other and with the\u0000surface. Moreover, in a jet array, each jet is surrounded by at\u0000least two jets, so in this work we investigated heat transfer of\u0000two- and three-jet cooling and looked for differences between\u0000them. In the experiments, the distances between the jets and from\u0000the nozzle to the surface were varied. Local heat transfer\u0000characteristics were analyzed using infrared thermography. It was\u0000found that at distance s/D (=) 1.2, the distribution of local Nu\u0000for the three-jet interaction differs significantly from the\u0000two-jet interaction, however, at s/D (=) 1.8, there are almost no\u0000visible distinguishing characters.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 2","pages":"266 - 275"},"PeriodicalIF":1.4,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145296877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nucleation of Spatial Wave Modes on the Surface of a Viscous Fluid Film Flowing down a Vertical Cylinder at the Appearance of New Instability Regions 在新的不稳定区域出现时，沿垂直圆柱体向下流动的粘性流体膜表面空间波模的成核

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-10-16 DOI: 10.1134/S1810232825020067

O. Yu. Tsvelodub

引用次数: 0

Hall Currents and Soret Effects on MHD Heat and Mass Transfers Flow with Induced Magnetic Field and Current Density between Plates 霍尔电流和索雷特对磁感应磁场和板间电流密度下磁感应传热传质的影响

IF 1.4 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2025-10-16 DOI: 10.1134/S1810232825020171

H. K. Mandal, D. K. Maiti, R. N. Jana

{"title":"Hall Currents and Soret Effects on MHD Heat and Mass Transfers Flow with Induced Magnetic Field and Current Density between Plates","authors":"H. K. Mandal, D. K. Maiti, R. N. Jana","doi":"10.1134/S1810232825020171","DOIUrl":"10.1134/S1810232825020171","url":null,"abstract":"This study explores the flow of a viscous, incompressible, and electrically conducting fluid between plates, where one is perfectly conducting and the other is non-conducting. It focuses on the influence of thermal and solutal buoyancy forces on heat and mass transfer driven by free convection. Both plates are of infinite length, and a uniform transverse magnetic field is imposed to the flow. The analysis also incorporates the effect of chemical reactions within the fluid. The governing equations for momentum, thermal energy, mass concentration, and generalized Ohm’s law are solved with the Laplace transform method. The study examines the influence of various key parameters, including the Hartmann number, Hall current, Soret number, thermal and solutal Grashof numbers, radiation parameter, Schmidt number, and chemical reaction parameter, on flow characteristics (such as velocity profiles and shear stress), heat transfer (temperature profiles and Nusselt number), mass transfer (concentration profiles and Sherwood number), along with the induced magnetic field and current density. The Lorentz force within the flow suppresses convective activities in the flow domain, leading to a reduction in the viscous drag forces exerted on the plates. Among the governing parameters, the Soret number and thermal buoyancy forces play a particularly significant role in shaping the current flow configuration. The magnetic field strength decreases as we move from the conducting plate toward the non-conducting plate. Additionally, the variation in the density of the induced current (and its velocity) between the plates exhibits a parabolic distribution, with the peak values occurring near the center of the flow. When buoyancy forces are sufficiently large and directed forward or downward, they can alter both the flow direction and the orientation of the induced magnetic field and current density.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"34 2","pages":"428 - 450"},"PeriodicalIF":1.4,"publicationDate":"2025-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145296421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0