Heat and Mass Transfer最新文献_第2页

Micro-fin tubes for improved flow boiling heat transfer in refrigeration systems: a performance comparison with R134a and R407c refrigerants 用于改善制冷系统中流动沸腾传热的微鳍管：与 R134a 和 R407c 制冷剂的性能比较

IF 1.7 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-08 DOI: 10.1007/s00231-024-03511-x

Neeraj Kumar Vidhyarthi, Ishita Karmakar, Vaishnav Pal, Sudip Chandra Das, Prashant Raj, Sandipan Deb, S. Gajghate, Sagnik Pal, Ajoy Kumar Das

引用次数: 0

PLC and SCADA based temperature control of heat exchanger system through fractional order PID controller using metaheuristic optimization techniques 利用元启发式优化技术，通过分数阶 PID 控制器实现基于 PLC 和 SCADA 的热交换器系统温度控制

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-06 DOI: 10.1007/s00231-024-03509-5

Basant Tomar, Narendra Kumar, Mini Sreejeth

{"title":"PLC and SCADA based temperature control of heat exchanger system through fractional order PID controller using metaheuristic optimization techniques","authors":"Basant Tomar, Narendra Kumar, Mini Sreejeth","doi":"10.1007/s00231-024-03509-5","DOIUrl":"https://doi.org/10.1007/s00231-024-03509-5","url":null,"abstract":"SCADA systems play an important role in tracking the behaviour of critical process variables and connecting geographically dispersed subsystems at the industrial plant level. This article presents a PLC and SCADA-based control framework to automate and supervise the temperature control processes in the heat exchanger plant. The OMRON (NX1P2-9024DT1) PLC is interfaced with the Wonderware InTouch SCADA system to gather data, create a simulated temperature control prototype and carry out the necessary control operations within the heat exchanger plant. The PLC controls the entire process and programming of PLC is done using Sysmac studio automation software using the ladder programming language. The proposed system controls the temperature of the heat exchanger system through PID and Fractional Order PID (P ({text{I}}^{uplambda }{text{D}}^{upmu })) controllers with Integral Anti-windup technique. Various control strategies like Cascade Control, Feedforward Control and Smith Predictor for time delayed process are discussed for controlling the temperature of the process. The performance of both PID and fractional order PID controllers is optimized using adaptive heuristic optimization techniques like Genetic Algorithm (GA), Ant Colony Optimization (ACO) and Particle Swarm Optimization (PSO). In control system design and analysis, the calculated performance indices are used as quantitative measures for evaluating the performance of a system. The combined form of temperature controller with Cascade control, Feedforward control and dead-time compensator is modelled and examined for simulation using MATLAB. Simulation and real-time experimentation analysis of the developed controllers are executed with metaheuristic optimization techniques based on different performance indices like ISE, IAE and ITAE.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947262","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

Numerical simulation of heat transfer performance and convective vortex evolution in a phase change thermal storage device with dispersed heat sources 对带有分散热源的相变蓄热装置的传热性能和对流漩涡演化进行数值模拟

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-06 DOI: 10.1007/s00231-024-03507-7

Jianlong Zi, Wei Long, Yunlong Liu, Tingting Lin

{"title":"Numerical simulation of heat transfer performance and convective vortex evolution in a phase change thermal storage device with dispersed heat sources","authors":"Jianlong Zi, Wei Long, Yunlong Liu, Tingting Lin","doi":"10.1007/s00231-024-03507-7","DOIUrl":"https://doi.org/10.1007/s00231-024-03507-7","url":null,"abstract":"A numerical model based on the enthalpy method for solidification/melting that incorporates liquid-phase convection was established for a shell-and-tube phase-change thermal energy storage device with dispersed heat sources. This model optimized the heat source structure and simulated the phase change process, thermal storage performance, and evolution and effects of convection-induced vortices. To overcome the limitations of melting blind spots in traditional inner-tube heat sources, a dispersed heating approach was introduced to optimize the heat source distribution on the inner and outer tubes without changing the heat exchange area. The optimal heat source model demonstrated superior heat transfer performance, featuring an inner-tube top heat source and three uniformly distributed outer-tube bottom heat sources at a dispersion angle of 60°. It reduced the complete melting time by 70.88% compared to the inner-tube heat source alone and by 51.99% compared to the outer-tube bottom heat source. The dispersed heat sources effectively utilized the natural convection benefits at the upper inner side and enhanced the heat transfer at the lower sections to address the melting blind spots of the central heat source, thereby improving the uniformity of the process. The enhancement in heat transfer within the dispersed heat source model is primarily due to the optimized heat source distribution, which facilitates a more dispersed and uniform vortex evolution during the phase change. This promotes the development of the liquid-solid interface and reduces the mutual interference in convection vortex expansion. Hence, the internal heat transfer rate and thermal storage capacity of the system are improved.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947260","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

Predicting energy transfer to the workpiece in wire electrical discharge machining using inverse heat transfer technique 利用反热传导技术预测线材放电加工中向工件的能量传递

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-06 DOI: 10.1007/s00231-024-03505-9

Parth Sathavara, Ajit Kumar Parwani, Paritosh Chaudhuri

{"title":"Predicting energy transfer to the workpiece in wire electrical discharge machining using inverse heat transfer technique","authors":"Parth Sathavara, Ajit Kumar Parwani, Paritosh Chaudhuri","doi":"10.1007/s00231-024-03505-9","DOIUrl":"https://doi.org/10.1007/s00231-024-03505-9","url":null,"abstract":"In the context of wire electrical discharge machining (WEDM), determining the fraction of thermal energy transferred to the workpiece (fc) is crucial for numerical modelling. This information is necessary to anticipate material removal mechanisms and understand thermal behaviour. In this study, two metaphor-less Rao algorithms are modified to solve the inverse heat conduction problem (IHCP) for the estimation of fc during the WEDM process without knowing any prior information on the transient functional form of fc. These two algorithms are compared in terms of accuracy and convergence speed. The Rao-1 algorithm stands out with high accuracy and rapid convergence. To evaluate the algorithm applicability in estimating fc, the following cases are considered: (1) a numerical investigation with artificial Gaussian error in simulated temperature readings and (2) a real-time experiment on WEDM setup with varying discharge currents. The RMS error between the actual and estimated value of fc with SS-304 material during numerical investigation is found to be 562 W/m which is just 0.008 times of heat source. Real-time experiments reveal that the discharge current is directly proportional to the total energy supplied by the wire as well as fc. The fc values estimated by the proposed inverse algorithm with various discharge currents fall within the range of 15–18%, aligning with the existing literature. This shows the proposed methodology is accurate and can be extended to incorporate other machining processes.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947259","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

Numerical investigation of the heating efficiency of CO2 heat pump water heater system in cold environments 寒冷环境下二氧化碳热泵热水器系统加热效率的数值研究

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-05 DOI: 10.1007/s00231-024-03508-6

Jiazhen He, Shuhong Li

引用次数: 0

Investigation of the radial uniform and variable inflow profiles to improve production in the perforated horizontal wellbore 研究径向均匀和可变流入剖面，提高穿孔水平井筒的产量

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-02 DOI: 10.1007/s00231-024-03503-x

Hasanain J. Kareem, Hasril Hasini, Mohammed A. Abdulwahid

{"title":"Investigation of the radial uniform and variable inflow profiles to improve production in the perforated horizontal wellbore","authors":"Hasanain J. Kareem, Hasril Hasini, Mohammed A. Abdulwahid","doi":"10.1007/s00231-024-03503-x","DOIUrl":"https://doi.org/10.1007/s00231-024-03503-x","url":null,"abstract":"This study delved into the efficacy of enhanced oil production (EOP) within perforated horizontal wellbores across diverse flow profiles. The authors implemented five distinct configurations, encompassing uniform radial air injection (profile 1) and variable radial air injection (profiles 2–5), with a particular emphasis on the concomitant production of liquid and air phases. Additionally, the study examined the frictional behavior along the perforated wellbore. Liquid production was demonstrably amplified throughout the bubble, plug, and slug flow regimes; however, a decline was observed in the stratified, stratified transition, and stratified wave flow regimes. Notably, the liquid product exhibited a direct correlation with both the mixture flow rate and its associated Reynolds number, signifying an increase with holdup and a decrease with void fraction. Conversely, air production displayed a positive association with a higher air flow rate. Overall, profiles 2 and 4 yielded the most favorable production during the bubble, plug, slug, and stratified flow regimes. In contrast, profile 3 emerged as the optimal configuration for the stratified transition and stratified wave flow regimes. The friction factor remained relatively constant with profile 1, experienced a reduction in profile 2, and exhibited an escalation in profile 3. Additionally, it increased in the middle of profile 4 and decreased at the center of the perforated section in profile 5. The friction factor behavior of profile 1 remained stable and smooth due to the invariant air flow rate throughout the perforated section. Conversely, some fluctuation was observed in profile 2 due to the inherent variability of the radial air injection along the perforated section. Importantly, the experimental and numerical results demonstrated satisfactory agreement across all flow patterns, with some minor discrepancies noted in the static pressure drop behavior during the bubble, dispersed bubble, and slug flow regimes.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141880462","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

Dual scale porous medium model of lung congestion caused by tuberculosis 肺结核引起肺充血的双尺度多孔介质模型

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-07-31 DOI: 10.1007/s00231-024-03504-w

Aarthi Thangavelu, Arunn Narasimhan

{"title":"Dual scale porous medium model of lung congestion caused by tuberculosis","authors":"Aarthi Thangavelu, Arunn Narasimhan","doi":"10.1007/s00231-024-03504-w","DOIUrl":"https://doi.org/10.1007/s00231-024-03504-w","url":null,"abstract":"Pulmonary tuberculosis is a chronic respiratory disease and lung infection that can be fatal if left untreated, as severe cases lead to compromised oxygen exchange at the alveolar level. This study uses a dual-scale porous medium model and computational methods to understand the nature of tuberculosis infection spread within the lungs and its effects on the alveolar oxygen exchange. The entire lung is modelled as a global, equivalent, heterogeneous porous medium comprising three zones with varying permeabilities that correspond to 23 generations of airflow branches. Airflow during each breathing cycle is simulated by solving transient mass and momentum transfer equations across the three zones of the global model. A separate local model is invoked in zone 3, to analyse oxygen exchange between the alveolar airflow and incoming capillary blood via mass transfer equations. The transient mass exchange equations are solved in the local model to yield the percentage of oxygen transferred to the blood. Tuberculosis spread – and hence, the congestion of the lung – is introduced by modifying the permeability and porosity of the global porous medium model. The impact of infection on the overall bloodstream oxygen content is evaluated by concurrent use of the global and local models. For the case with sudden reduction in immunity, severe infection condition is observed at (varvec{86%}) of the total infection spreading time and at (varvec{75%}) for the case with gradual reduction in immunity. For (varvec{40%}) increase in immunity beyond the (varvec{50% Gamma }) stage, it is observed from the simulations that the severe infection situation is completely avoided, preventing any further tuberculosis spread.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870417","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

Effects of magnetic field on CO2 hydrate phase equilibrium 磁场对二氧化碳水合物相平衡的影响

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-07-30 DOI: 10.1007/s00231-024-03506-8

Shicai Sun, Junhao Cui, Linlin Gu, Wanxin Tian, Yanmin Li, Yonghao Yin

{"title":"Effects of magnetic field on CO2 hydrate phase equilibrium","authors":"Shicai Sun, Junhao Cui, Linlin Gu, Wanxin Tian, Yanmin Li, Yonghao Yin","doi":"10.1007/s00231-024-03506-8","DOIUrl":"https://doi.org/10.1007/s00231-024-03506-8","url":null,"abstract":"The conditions and influencing factors of hydrate formation is significant for hydrate technology. Combining with the existing literatures and the experimental data of this work, the phase equilibrium of CO2 hydrate in (NaCl/CaCl2/MgCl2) ionic solutions, pure water-sediment system and (NaCl/CaCl2/MgCl2) ionic solution-sediment systems under the static magnetic field (0.39 T) was studied. Moreover, the effect mechanism of magnetic field on hydrate phase equilibrium in different systems was analyzed in terms of intermolecular interaction. Under the same pressure, the magnetic field increased the phase equilibrium temperature of CO2 hydrate by 2.0–2.8 K in the three ionic solutions, which improved the hydrate formation conditions. This is mainly due to that the magnetic effect increases water activity and weakens the ionic hydration shells, thus promotes hydrate formation. In addition, compared with the ionic solution systems without magnetic field, the magnetic field increased the hydrate phase equilibrium temperature by 0.1–2.5 K in the ionic solution-sediment systems. However, the degree of temperature increase is less than that in the magnetic field-ionic solution systems, which is because the magnetic field enhances the binding between ions and the sediment particle in sediment-bearing systems. Compared with the magnetic field-ionic solution systems, the water activity in the magnetic field-ionic solution-sediment systems is lower, which makes hydrate formation more difficult. Moreover, with the movement of cations and anions in magnetic field, the crystals may be formed due to ion collisions, enhance the capillary action in ionic solution-sediment systems, and then hinder the hydrate formation. Therefore, the sediments can weaken the magnetic field promotion to hydrate formation.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870416","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

Numerical and experimental analysis of the sinusoidal heat flux source of heat transfer in laminar flow in a tube for single phase flow 管内层流中单相流传热的正弦热通量源的数值和实验分析

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-07-26 DOI: 10.1007/s00231-024-03501-z

S. Solnař

引用次数: 0

Variation in the electrical properties of gabbro after microwave heating 微波加热后辉长岩电特性的变化

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-07-26 DOI: 10.1007/s00231-024-03502-y

Zhenlong Ge, Yuhua Guan, Chao Lyu

{"title":"Variation in the electrical properties of gabbro after microwave heating","authors":"Zhenlong Ge, Yuhua Guan, Chao Lyu","doi":"10.1007/s00231-024-03502-y","DOIUrl":"https://doi.org/10.1007/s00231-024-03502-y","url":null,"abstract":"Microwave assistance has the potential to reduce the energy input required for mechanical rock breaking. This study systematically investigated the changes in electrical properties (specifically resistivity, capacitance, and impedance) of gabbro after microwave heating during the graded loading process, as well as its internal fracture mechanism. The findings indicate that the variations in resistivity, impedance, and capacitance of gabbro can be divided into three stages during the graded loading process: the compaction stage, elastic-steady cracking stage, and nonlinear crack propagation stage. When the strain level exceeds 70%, the resistivity and impedance start to increase, and the capacitance begins to decrease. The study also identifies a significant positive correlation between microwave power and the rate of temperature increase on the rock surface. A critical power threshold of approximately 2 kW is observed, below which achieving rapid temperature rise becomes challenging, but beyond which the temperature escalates swiftly with the energy input. Once the temperature exceeds 350 °C, rupturing mineral inclusions generate numerous microcracks, causing resistivity and impedance to exponentially increase. Furthermore, microwave heating induces a temperature differential exceeding 200 °C between the internal and external regions of the rock. Under the same radiation energy, high-power short-duration radiation is more likely to generate thermally induced cracks within the rock. The rapid expansion and heating of absorbent minerals, as well as the rupture of inclusions, further intensify the propagation of microcracks, greatly reducing the mechanical properties of the rock. This study will provide theoretical guidance for microwave-assisted mechanical rock excavation.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141770288","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