International Communications in Heat and Mass Transfer最新文献_第10页

Moist air transfer and frost distribution characteristics in low-temperature refrigerator

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2025-03-20 DOI: 10.1016/j.icheatmasstransfer.2025.108875

Guixiang He , Guoqiang Liu , Tianyang Zhao , Gang Yan , Huawei Zhang

{"title":"Moist air transfer and frost distribution characteristics in low-temperature refrigerator","authors":"Guixiang He , Guoqiang Liu , Tianyang Zhao , Gang Yan , Huawei Zhang","doi":"10.1016/j.icheatmasstransfer.2025.108875","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108875","url":null,"abstract":"<div><div>The application of low-temperature refrigerators set below −30 °C is increasing. Compared to conventional refrigerators set at 5 °C/−18 °C, these low-temperature units face more severe frost issues within their cabinets, which have received less attention. This study focuses on the frost issue in a low-temperature cabinet at −40 °C. Firstly, tracer gas technology and computational fluid dynamics (CFD) simulation were employed innovatively to obtain the moist air transfer rate. Based on this, the distribution ratio of frost between the cabinet walls and evaporator was analyzed. The results show that the moist air transfer rates entering the cabinet through the gasket, defrosting drainage tube, and door opening-closing process are 35.62 g·h<sup>−1</sup>, 7.12 g·h<sup>−1</sup>, and 295.7 g per opening. Among these, 67.5 % of the water vapor condenses into frost on the cabinet walls. This increases the difficulty in opening the door, affecting the user experience. Implementing −30 °C and −18 °C frost transfer modes can reduce the frost ratio on the cabinet walls to 52.7 % and 11.4 %. The average door opening force also decreased from 91.3 N to 70.6 N and 51.1 N. This study first explores laws of the moist air transfer rate and frosting distribution in −40 °C low-temperature refrigerator, establishes theoretical foundations to address the frosting issue within cabinet of such refrigerators.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108875"},"PeriodicalIF":6.4,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 study on the flow and thermal characteristics of a two-phase closed thermosyphon filled with low surface tension working fluid under various wettability

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2025-03-19 DOI: 10.1016/j.icheatmasstransfer.2025.108848

Wandong Min, Wei Zhong, Lin Wang, Yanping Yuan, Xiaoling Cao

{"title":"Numerical study on the flow and thermal characteristics of a two-phase closed thermosyphon filled with low surface tension working fluid under various wettability","authors":"Wandong Min, Wei Zhong, Lin Wang, Yanping Yuan, Xiaoling Cao","doi":"10.1016/j.icheatmasstransfer.2025.108848","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108848","url":null,"abstract":"<div><div>Although two-phase closed thermosyphons (TPCTs) with low surface tension fluids are increasingly being applied in various fields, existing studies mainly focus on TPCTs with water as the working fluid under different wettability, and there is a lack of research on the condensation dynamics of low surface tension fluids in TPCTs under varying wettability. This paper addresses this gap by presenting a novel CFD model that integrates a dynamic condensation mass transfer time relaxation parameter into the Lee model and couples it with the contact angle model. The results indicate that the numerical model is more accurate in simulating the formation of a liquid film when the liquid phase is set for the primary phase and the density model of the vapor phase is used as an incompressible ideal gas. When low surface tension working fluids, such as methanol and ethanol, are used in TPCTs, the size of bubbles and boiling intensity in the evaporator are lower compared to when water is used as the working fluid. Surface tension and gravity induce the formation of a fluctuating condensate film on the condenser of a methanol-TPCT. The liquid film in the condenser of the ethanol-TPCT is approximately 1.5 times thicker than that of the methanol-TPCT. As the contact angle increases, the thickness of the liquid film on the wall decreases, leading to the phenomenon of temperature rise on the upper wall of the evaporator. These advancements provide a design tool for next-generation TPCTs in applications like data center cooling and hyperloop systems.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108848"},"PeriodicalIF":6.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Dynamics of vapor bubble train in flow boiling heat transfer in microchannels

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2025-03-19 DOI: 10.1016/j.icheatmasstransfer.2025.108859

Odumuyiwa A. Odumosu , Tianyou Wang , Zhizhao Che

{"title":"Dynamics of vapor bubble train in flow boiling heat transfer in microchannels","authors":"Odumuyiwa A. Odumosu , Tianyou Wang , Zhizhao Che","doi":"10.1016/j.icheatmasstransfer.2025.108859","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108859","url":null,"abstract":"<div><div>Microchannel flow boiling is a promising technique for micro-device thermal management, and understanding the bubble dynamics in microchannel flow boiling is important for the applications. Previous studies only focused on single, isolated bubbles, but the bubbles in microchannel flow boiling applications often exist as bubble trains, in which the bubbles interact with each other. Here, we investigate numerically vapor bubble trains in microchannel flow boiling by adopting the flow-focusing technique to form monodispersed bubbles in the upstream of the microchannel. With increasing the initial vapor–liquid volume ratio, the bubble frequency increases while the growth rate of the bubbles decreases because of the reduced bubble size. With increasing the heat flux on the wall or reducing the latent heat of the working fluid, the bubble train growth rate increases because of the increased vaporization rate. The vaporization of the fluid in the upstream causes the bubble expansion and accelerates the bubble movement in the downstream. The wall temperature and the Nusselt number fluctuate because of the periodic pass-through of bubbles.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108859"},"PeriodicalIF":6.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

A novel hybrid deep learning algorithm for estimating temperature-dependent thermal conductivity in transient heat conduction problems

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2025-03-19 DOI: 10.1016/j.icheatmasstransfer.2025.108871

Wenkai Qiu, Haolong Chen, Huanlin Zhou

{"title":"A novel hybrid deep learning algorithm for estimating temperature-dependent thermal conductivity in transient heat conduction problems","authors":"Wenkai Qiu, Haolong Chen, Huanlin Zhou","doi":"10.1016/j.icheatmasstransfer.2025.108871","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108871","url":null,"abstract":"<div><div>Thermal conductivity is a fundamental parameter in heat transfer, and effectively identifying the thermal conductivity property of materials is crucial for engineering applications. A novel deep learning framework combining bidirectional long short-term memory (Bi-LSTM) networks and multi-head self-attention (MSA) mechanisms is proposed to estimate temperature-dependent thermal conductivity for transient inverse heat conduction problems. The training data is obtained through finite element method (FEM). The temperature fields are utilized as inputs to train the network, enabling it to predict unknown thermal conductivity. A dynamic learning rate decay adjustment strategy is adopted to improve the performance of the model. In the proposed novel hybrid models, Bi-LSTM captures both forward and backward dependencies in the input data, while MSA enhances the learning ability of the model in complex nonlinear relationships by processing input sequences in parallel with different attention weights. Numerical examples analyze the effects of noise and the proportion of training samples on the prediction results, and the results show that the proposed network is less sensitive to noise. Moreover, comparison with other deep learning models highlights the superiority of the proposed framework. It demonstrates accuracy and effectiveness of the proposed method in identifying temperature-dependent thermal conductivity in 2D and 3D models.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108871"},"PeriodicalIF":6.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Experimental and numerical investigations on convective heat transfer characteristics of sCO2 in a 10 mm horizontal pipe

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2025-03-19 DOI: 10.1016/j.icheatmasstransfer.2025.108800

Ziqi Li , Yulin Chen , Yingjuan Shao , Wenqi Zhong

{"title":"Experimental and numerical investigations on convective heat transfer characteristics of sCO2 in a 10 mm horizontal pipe","authors":"Ziqi Li , Yulin Chen , Yingjuan Shao , Wenqi Zhong","doi":"10.1016/j.icheatmasstransfer.2025.108800","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108800","url":null,"abstract":"<div><div>This study examines heat transfer characteristics of sCO<sub>2</sub> in horizontal tubes with an inner diameter of 10 mm on a self-built experimental system. The effects of operating parameters on heat transfer were investigated. The results indicate that elevating the mass flow rate significantly improves sCO<sub>2</sub> heat transfer efficiency and mitigates heat transfer deterioration (HTD). Conversely, higher inlet temperatures, pressures, and heat flow densities intensify wall temperatures, exacerbating HTD. Moreover, a novel parameter have been mentioned for sCO<sub>2</sub> in the horizontal tube, as the critical heat-to-mass ratio ((q/G)<sub>max</sub>).The overall heat transfer performance of sCO<sub>2</sub> will be optimized when the q/G is adjusted to 0.17. Deviation from this value (0.17) may result in HTD. The mechanism of HTD in the horizontal tube was investigated through analysis of thermophysical properties velocity, distribution and turbulent kinetic energy of sCO<sub>2</sub>. Finally, new convective heat transfer correlations were proposed by considering the effect of buoyancy force, with more than 90 % of heat transfer coefficient predictions falling within ±20 % relative error. This model can provide insights for the design and operational safety of heat exchange equipment in Brayton cycle coal-fired power generation systems.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108800"},"PeriodicalIF":6.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

An analytical inverse model for predicting the critical thickness of the protective bank inside a cylindrical smelting furnace

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2025-03-19 DOI: 10.1016/j.icheatmasstransfer.2025.108874

Ahmed El-Hassnaoui, Marcel Lacroix

{"title":"An analytical inverse model for predicting the critical thickness of the protective bank inside a cylindrical smelting furnace","authors":"Ahmed El-Hassnaoui, Marcel Lacroix","doi":"10.1016/j.icheatmasstransfer.2025.108874","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108874","url":null,"abstract":"<div><div>A protective bank is essential for ensuring the integrity and the energy efficiency of high temperature electric ilmenite smelting furnaces. If the thickness of the protective bank is insufficient or unstable, the refractory walls are directly exposed to molten materials, extreme thermal loads and chemical interactions, accelerating degradation and increasing heat losses. Conventional inverse models rely on iterative processes with high computational costs, limiting real-time capabilities. To overcome this limitation, an analytical inverse model is developed, enabling real-time assessment of furnace integrity based on sensor measurements.</div><div>In this paper, a direct numerical model is first developed and validated to simulate the thermal behavior of a cylindrical smelting furnace. This 2D axisymmetric model accounts for the presence of two superimposed melted layers, iron and slag, while incorporating phase change and endothermic chemical reactions. Next, a 1D analytical inverse model is introduced to predict the critical thickness of the protective bank. Sensor placement is analyzed, demonstrating that deep insertion into the refractory wall enhances measurement accuracy.</div><div>The proposed inverse model successfully determines the critical bank thickness and is further extended to reconstruct its profile by integrating multiple sensors along the furnace height. To account for 2D heat transfer effects in the iron and slag layers, a model correction is introduced, significantly improving prediction accuracy. The results confirm the effectiveness of the proposed approach. Additionally, a measurement error analysis highlights the model's robustness, reinforcing its potential for real-time monitoring and control of high-temperature smelting furnaces.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108874"},"PeriodicalIF":6.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Research on the lubrication flow field characteristics of the main bearing of a tunnel boring machine

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2025-03-19 DOI: 10.1016/j.icheatmasstransfer.2025.108861

Zhihong Xiong , Nanzhong Chen

引用次数: 0

Intelligent and optimized nanofluid heat transfer for tube shape heat exchanger

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2025-03-18 DOI: 10.1016/j.icheatmasstransfer.2025.108864

Dr. Endrick Divyakant Contractor , Bhoomika Amrutlal Domadia , Ashishkumar Modi , Darshana Dhirajbhai Dhimmar

{"title":"Intelligent and optimized nanofluid heat transfer for tube shape heat exchanger","authors":"Dr. Endrick Divyakant Contractor , Bhoomika Amrutlal Domadia , Ashishkumar Modi , Darshana Dhirajbhai Dhimmar","doi":"10.1016/j.icheatmasstransfer.2025.108864","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108864","url":null,"abstract":"<div><div>The heat exchange approach is used in various thermal systems for industrial applications. The optimal heat exchange system possesses efficiency in heat management, minimal operating load with maximum outcomes, operational flexibility of the moving fluids, better heat transfer capacity with optimal flow management, and low initialization cost and maintenance charges. The inclusion of nanofluids in heat exchange systems is a recently evolved approach. Thereafter, the effective functioning of the heat exchange system is primarily based on the nanoparticle characteristics along with the hot fluid. This study aims to deliver a novel decision hybrid optical system (DHOS) in heat exchange systems to predict outcomes. The heat exchange system adopted is of shell and tube type with titanium dioxide (TiO<sub>2</sub>) as the heat exchanging fluid running on the tubes with TiO<sub>2</sub>-based nanoparticles. The model is optimized for optimal drop in pressure and transfer of heat. Then, the parameters in the system in transferring heat, entropy measure, and error rate are determined and correlated with the recent models. The bejan number of the entropy measure is also specified for the heat exchange system.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108864"},"PeriodicalIF":6.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

A review of design and operation aspects in supercritical CO2 cycles: Research status and future perspectives

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2025-03-18 DOI: 10.1016/j.icheatmasstransfer.2025.108867

Xiaoting Chen , Wenshuai Que , Zongrun Wang , Jun Wu , Guang Wang

{"title":"A review of design and operation aspects in supercritical CO2 cycles: Research status and future perspectives","authors":"Xiaoting Chen , Wenshuai Que , Zongrun Wang , Jun Wu , Guang Wang","doi":"10.1016/j.icheatmasstransfer.2025.108867","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108867","url":null,"abstract":"<div><div>The supercritical CO₂ cycle is recognized as one of the most promising technologies in the field of high-temperature heat sources due to its compactness and high efficiency. Current research primarily focuses on the optimization and control of supercritical CO₂ cycles, encompassing aspects such as cycle layouts, design parameters, components, dynamic performance, control strategies and control methods. However, all designs are carried out separately without effective summarization. This paper provides a comprehensive review of design and operation aspects in supercritical CO<sub>2</sub> cycles. The integration system schemes based on supercritical CO<sub>2</sub> cycles are also reviewed, such as combining with energy storage systems, thermodynamic cycle systems, and multigeneration systems. This study provides latest developments, advanced design, key challenges, and future perspectives of supercritical CO<sub>2</sub> cycles, inspiring the utilization of machine learning techniques to solve optimization and control issues. It is of great significance for the development and application of supercritical CO<sub>2</sub> cycles and the reduction of carbon emissions.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108867"},"PeriodicalIF":6.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Jet performance exploration of an ejector for multi-parallel ejector air curtain

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2025-03-18 DOI: 10.1016/j.icheatmasstransfer.2025.108868

Yabo Wang, Xinxin Guo, Xinghua Liu, Cong Shi

{"title":"Jet performance exploration of an ejector for multi-parallel ejector air curtain","authors":"Yabo Wang, Xinxin Guo, Xinghua Liu, Cong Shi","doi":"10.1016/j.icheatmasstransfer.2025.108868","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108868","url":null,"abstract":"<div><div>Since conventional fan-driven air curtains are unsuitable for the blood plasma cold storage, the proposed multi-parallel ejector air curtain (EAC) in previous research could address these issues by utilizing compressed air ejectors arranged in parallel, forming an effective air barrier to minimize air infiltration and associated cooling load loss. As the key component of EAC, the jet performance of ejector plays a significant role in the aerodynamic sealing of the cold storage. The study focuses on optimizing key geometric parameters of the ejector, specifically the area ratio (AR) and the nozzle exit position (NXP). Experimental measurements and numerical simulations were conducted to evaluate the jet performance of different ejector configurations. Then the best and the original configurations of ejectors (Case 2 and Case 5) were applied to compose EAC for comparatively explore the impact of operational parameters on sealing performance of cold store. Results indicate that Case 2 ejectors significantly enhance performance of the EAC with a maximum aerodynamic sealing of 66.35 %. And compared with the EAC composed of Case 5 ejectors, the internal average temperature rise and the moisture content in cold storage were reduced by 0.2 °C and 3.78 % respectively, when fixed with Case 2 ejectors.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108868"},"PeriodicalIF":6.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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