R. Prasad, R. K. Nayak, Ujjwal Kumar Nayak, A. Gupta
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{"title":"ANALYTICAL STUDY OF THERMAL PERFORMANCE OF A JET PLATE SOLAR AIR HEATER WITH THE LONGITUDINAL FINS UNDER THE CROSS FLOW AND NON-CROSS FLOW CONDITIONS","authors":"R. Prasad, R. K. Nayak, Ujjwal Kumar Nayak, A. Gupta","doi":"10.5098/hmt.19.7","DOIUrl":"https://doi.org/10.5098/hmt.19.7","url":null,"abstract":".","PeriodicalId":46200,"journal":{"name":"Frontiers in Heat and Mass Transfer","volume":"69 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86452986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. Younis, F. Rashid, S. K. Fakhrulddin, Muhammad Asmail Eleiwi, A. Hussein, T. A. Tahseen, Mohammed Ibrahim Ahmed
The current study numerically analyzes the heat transfer enhancement and laminar fluid flow characteristics of four flat tubes with varying attack front airflow. The heat transfer characteristics of flat tubes are investigated in terms of Reynolds number, heat fluxes, and inclination angle. Four Reynolds numbers are studied (100, 200, 300, and 400), and three heat fluxes on the surface of the tubes are (1000, 2500, 3800 W/m 2 ), the inclination angle of the four flat tubes are (30 o , 45 o , 90 o ). ANSYS Fluent software v.18 discretizes and solves the governing equations using the finite volume approach across a specified control volume. According to the available data, using flat tubes increases the heat transfer in the channel. When tubes were used, the reattachment distance was reduced. When the Reynolds number is changed from 100 to 300, the heat transfer enhancement rises from 40.8 % to 55.79 % for the increase in the heat flux of 24.99 %.
{"title":"CFD SIMULATION IN THERMAL-HYDRAULIC ANALYSIS OF AIRFLOW ON DIFFERENT ATTACK ANGLES OF ROW FLAT TUBE","authors":"O. Younis, F. Rashid, S. K. Fakhrulddin, Muhammad Asmail Eleiwi, A. Hussein, T. A. Tahseen, Mohammed Ibrahim Ahmed","doi":"10.5098/hmt.19.6","DOIUrl":"https://doi.org/10.5098/hmt.19.6","url":null,"abstract":"The current study numerically analyzes the heat transfer enhancement and laminar fluid flow characteristics of four flat tubes with varying attack front airflow. The heat transfer characteristics of flat tubes are investigated in terms of Reynolds number, heat fluxes, and inclination angle. Four Reynolds numbers are studied (100, 200, 300, and 400), and three heat fluxes on the surface of the tubes are (1000, 2500, 3800 W/m 2 ), the inclination angle of the four flat tubes are (30 o , 45 o , 90 o ). ANSYS Fluent software v.18 discretizes and solves the governing equations using the finite volume approach across a specified control volume. According to the available data, using flat tubes increases the heat transfer in the channel. When tubes were used, the reattachment distance was reduced. When the Reynolds number is changed from 100 to 300, the heat transfer enhancement rises from 40.8 % to 55.79 % for the increase in the heat flux of 24.99 %.","PeriodicalId":46200,"journal":{"name":"Frontiers in Heat and Mass Transfer","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75377161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"EFFECT OF TERM OF ERROR ON WET BULB TEMPERATURE MEASUREMENT USING ASPIRATION PSYCHROMETER","authors":"Anirban Sur, V. Bhatkar, Anindita Roy","doi":"10.5098/hmt.19.3","DOIUrl":"https://doi.org/10.5098/hmt.19.3","url":null,"abstract":"","PeriodicalId":46200,"journal":{"name":"Frontiers in Heat and Mass Transfer","volume":"8 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82797080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"AAN ULTIMATE SOLUTION TO PHASING OUT FOSSIL FUELS – PART II: AIR-WATER THERMAL POWER PLANTS FOR UTILITY-SCALE POWER PRODUCTION AT LOW TEMPERATURES","authors":"Yiding Cao","doi":"10.5098/hmt.19.2","DOIUrl":"https://doi.org/10.5098/hmt.19.2","url":null,"abstract":"","PeriodicalId":46200,"journal":{"name":"Frontiers in Heat and Mass Transfer","volume":"17 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82633930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Prasad, Ujjwal Kumar Nayak, R. K. Nayak, A. Gupta
{"title":"COMBINED NATURAL CONVECTION AND SURFACE RADIATION IN A SQUARE CAVITY WITH THE INVERSELY LINEARLY HEATED OPPOSITE SIDE WALLS","authors":"R. Prasad, Ujjwal Kumar Nayak, R. K. Nayak, A. Gupta","doi":"10.5098/hmt.19.4","DOIUrl":"https://doi.org/10.5098/hmt.19.4","url":null,"abstract":"","PeriodicalId":46200,"journal":{"name":"Frontiers in Heat and Mass Transfer","volume":"68 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74488127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"AN ULTIMATE SOLUTION TO PHASING OUT FOSSIL FUELS - PART I: UTILITY-SCALE UNDERGROUND HOT-WATER STORAGE (USUHWS) FOR POWER PRODUCTION AND HEAT SUPPLY","authors":"Yiding Cao","doi":"10.5098/hmt.19.1","DOIUrl":"https://doi.org/10.5098/hmt.19.1","url":null,"abstract":"","PeriodicalId":46200,"journal":{"name":"Frontiers in Heat and Mass Transfer","volume":"66 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88809588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"NUMERICAL STUDY ON HEAT TRANSFER CHARACTERISTICS OF CORRUGATED TUBE PHASE CHANGE THERMAL ENERGY STORAGE UNIT","authors":"Kun Zhang, Zhiyong Li, Jianhui Yao","doi":"10.5098/hmt.19.5","DOIUrl":"https://doi.org/10.5098/hmt.19.5","url":null,"abstract":"","PeriodicalId":46200,"journal":{"name":"Frontiers in Heat and Mass Transfer","volume":"18 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72520018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This article explores experimentally and numerically the effect of conductance on cooling of electronic chips by forced air flow in a vertical channel for thermal control. Experiments are conducted using substrates of FR4, bakelite, copper clad board (single layer) equipped with aluminum heat sources at uniform heat fluxes of 1000, 2000, and 3000 W/m 2 at 500 ≤ Re ≤ 1500. Computer simulations are performed to validate experimental results using a finite element method based COMSOL Multiphysics 4.3b software and the results are in agreements of below 10%. The temperatures obtained showed high thermal conductance copper clad boards (CCBs) are very low compared to FR4 and bakelite substrates. Results showed that FR4 and bakelite are unsuitable for airflow velocity of 0.6 m/s and heat flux of 3000 W/m 2 . However, the temperature variation between single and multilayer CCB is 3 to 4 ◦ C . The temperature reduction using CCB is 10 ◦ C compared to FR4 and bakelite.
{"title":"STUDY OF SUBSTRATE CONDUCTANCE EFFECT ON COOLING OF ELECTRONIC COMPONENTS","authors":"Shankar Durgam","doi":"10.5098/hmt.18.49","DOIUrl":"https://doi.org/10.5098/hmt.18.49","url":null,"abstract":"This article explores experimentally and numerically the effect of conductance on cooling of electronic chips by forced air flow in a vertical channel for thermal control. Experiments are conducted using substrates of FR4, bakelite, copper clad board (single layer) equipped with aluminum heat sources at uniform heat fluxes of 1000, 2000, and 3000 W/m 2 at 500 ≤ Re ≤ 1500. Computer simulations are performed to validate experimental results using a finite element method based COMSOL Multiphysics 4.3b software and the results are in agreements of below 10%. The temperatures obtained showed high thermal conductance copper clad boards (CCBs) are very low compared to FR4 and bakelite substrates. Results showed that FR4 and bakelite are unsuitable for airflow velocity of 0.6 m/s and heat flux of 3000 W/m 2 . However, the temperature variation between single and multilayer CCB is 3 to 4 ◦ C . The temperature reduction using CCB is 10 ◦ C compared to FR4 and bakelite.","PeriodicalId":46200,"journal":{"name":"Frontiers in Heat and Mass Transfer","volume":"30 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80636937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Large number of numerical computer simulations in engineering places is a serious burden on associated optimization problems nowadays. Kriging Surrogate based optimization (KSBO) becomes standard practice in analyzing expensive and time-consuming simulation. This paper aims to investigate the surrogate based analyze and optimization of thermal damage in living biological tissue by laser irradiation using a generalized duel phase model. The relationships of maximum temperature and thermal damage in living biological tissues of the response with two variables at a time are studied. The result shows that the surrogate model predicted response variables i.e, temperature and thermal damage are in good agreement with the original values. This result will help to predict the thermal damage and temperature of living tissue without solving the large numeric computer simulation rather using surrogate kriging model.
{"title":"KRIGING SURROGATE BASED OPTIMIZATION OF THERMAL DAMAGE TO LIVING BIOLOGICAL TISSUES BY LASER IRRADIATION BASED ON A GENERALIZED DUAL PHASE LAG MODEL","authors":"Nazia Afrin, Jonathan López, Juan Ocampo","doi":"10.5098/hmt.18.46","DOIUrl":"https://doi.org/10.5098/hmt.18.46","url":null,"abstract":"Large number of numerical computer simulations in engineering places is a serious burden on associated optimization problems nowadays. Kriging Surrogate based optimization (KSBO) becomes standard practice in analyzing expensive and time-consuming simulation. This paper aims to investigate the surrogate based analyze and optimization of thermal damage in living biological tissue by laser irradiation using a generalized duel phase model. The relationships of maximum temperature and thermal damage in living biological tissues of the response with two variables at a time are studied. The result shows that the surrogate model predicted response variables i.e, temperature and thermal damage are in good agreement with the original values. This result will help to predict the thermal damage and temperature of living tissue without solving the large numeric computer simulation rather using surrogate kriging model.","PeriodicalId":46200,"journal":{"name":"Frontiers in Heat and Mass Transfer","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45253918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sanping Li, Yu‐Liang Zhang, H. Lin, Jun-Jian Xiao, Li Zhang
Centrifugal pumps need to be stopped in the case of closing valve sometimes due to some specific application requirements. This paper presents a numerical simulation of the unsteady flow inside a low specific speed centrifugal pump during closed-valve forward and reverse stopping process. The study results show that the average internal pressure gradually decreases during stopping periods. At the same blade radius, the pressure on working surface is significantly higher than the suction surface. The pressure gradually increases from the impeller inlet to the outlet. The simulation fully shows the transient flow characteristics inside the centrifugal pump during forward and reverse stopping period.
{"title":"COMPARISON OF TRANSIENT CHARACTERISTICS OF A CENTRIFUGAL PUMP DURING FORWARD AND REVERSE STOPPING PERIODS","authors":"Sanping Li, Yu‐Liang Zhang, H. Lin, Jun-Jian Xiao, Li Zhang","doi":"10.5098/hmt.18.47","DOIUrl":"https://doi.org/10.5098/hmt.18.47","url":null,"abstract":"Centrifugal pumps need to be stopped in the case of closing valve sometimes due to some specific application requirements. This paper presents a numerical simulation of the unsteady flow inside a low specific speed centrifugal pump during closed-valve forward and reverse stopping process. The study results show that the average internal pressure gradually decreases during stopping periods. At the same blade radius, the pressure on working surface is significantly higher than the suction surface. The pressure gradually increases from the impeller inlet to the outlet. The simulation fully shows the transient flow characteristics inside the centrifugal pump during forward and reverse stopping period.","PeriodicalId":46200,"journal":{"name":"Frontiers in Heat and Mass Transfer","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49527504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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