Pub Date : 2022-09-07DOI: 10.1080/08916152.2022.2121875
W. Fan, Feng-quan Zhong
{"title":"Experimental study on flow and heat transfer of Al-kerosene nanofuels for regenerative cooling application","authors":"W. Fan, Feng-quan Zhong","doi":"10.1080/08916152.2022.2121875","DOIUrl":"https://doi.org/10.1080/08916152.2022.2121875","url":null,"abstract":"","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48282220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-28DOI: 10.1080/08916152.2022.2113931
Gamal B. Abdelaziz, M. Abdelgaleel, Z. Omara, A. S. Abdullah, E. El-Said, S. Sharshir, A. Elsaid, M. A. Dahab
{"title":"A simplified model of low Re, immiscible, gas–liquid flow, and heat transfer in porous media numerical solution with experimental validation","authors":"Gamal B. Abdelaziz, M. Abdelgaleel, Z. Omara, A. S. Abdullah, E. El-Said, S. Sharshir, A. Elsaid, M. A. Dahab","doi":"10.1080/08916152.2022.2113931","DOIUrl":"https://doi.org/10.1080/08916152.2022.2113931","url":null,"abstract":"","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2022-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47879866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Experimental investigation of heat transfer augmentation due to obstacles mounted in solar air heater duct","authors":"Himanshu Singh, Tabish Alam, Md Irfanul Haque Siddiqui, Masood Ashraf Ali, Dheeraj Sagar","doi":"10.1080/08916152.2022.2108166","DOIUrl":"https://doi.org/10.1080/08916152.2022.2108166","url":null,"abstract":"","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2022-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49113547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-09DOI: 10.1080/08916152.2022.2096152
Hsiu-Yang Tseng, Noel A. S. Alvarado, Jose Horacio Lizama, Yong-Ming Ye, Yi-Ming Hu
ABSTRACT An active method for heat transfer enhancement is proposed and thoroughly characterized for the first time for cryogenic quenching, in which mechanical vibrations are directly induced onto the sample to be quenched, employing a compact modular system composed of a pneumatic plunging device along with a DC motor/eccentric cam mechanism, generating oscillations on three different axes at a wide array of amplitude-frequency combinations. The quenching performance was investigated from both flow-field and thermal standpoints, through numerical simulations of the flow behavior, high-speed imaging of the process, and experimentally generated transient quenching and boiling curves under the influence of the governing parameters, underlining their combined effect on the mechanism of heat transfer augmentation. Under optimal conditions of amplitude and frequency, a remarkable CHF enhancement of 270% was obtained and the quenching time was reduced from 5 seconds to 1.8 seconds compared to the non-vibration case, where the vibration frequency was found to be the primary factor involved in the increase of oscillation-driven pressure drop and subsequent cavitation-induced CHF enhancement. Consequently, we are providing researchers in the field of cryogenics a method that not only provides enhanced performance but also offers flexibility enabling active control of the governing parameters of the system.
{"title":"Utilizing subsonic vibration in cryogenic quenching for heat flux enhancement","authors":"Hsiu-Yang Tseng, Noel A. S. Alvarado, Jose Horacio Lizama, Yong-Ming Ye, Yi-Ming Hu","doi":"10.1080/08916152.2022.2096152","DOIUrl":"https://doi.org/10.1080/08916152.2022.2096152","url":null,"abstract":"ABSTRACT An active method for heat transfer enhancement is proposed and thoroughly characterized for the first time for cryogenic quenching, in which mechanical vibrations are directly induced onto the sample to be quenched, employing a compact modular system composed of a pneumatic plunging device along with a DC motor/eccentric cam mechanism, generating oscillations on three different axes at a wide array of amplitude-frequency combinations. The quenching performance was investigated from both flow-field and thermal standpoints, through numerical simulations of the flow behavior, high-speed imaging of the process, and experimentally generated transient quenching and boiling curves under the influence of the governing parameters, underlining their combined effect on the mechanism of heat transfer augmentation. Under optimal conditions of amplitude and frequency, a remarkable CHF enhancement of 270% was obtained and the quenching time was reduced from 5 seconds to 1.8 seconds compared to the non-vibration case, where the vibration frequency was found to be the primary factor involved in the increase of oscillation-driven pressure drop and subsequent cavitation-induced CHF enhancement. Consequently, we are providing researchers in the field of cryogenics a method that not only provides enhanced performance but also offers flexibility enabling active control of the governing parameters of the system.","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2022-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47462927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-05DOI: 10.1080/08916152.2022.2105449
P. Sharma, S. Sahu, H. Yadav
ABSTRACT The present experimental study reports the flow and heat transfer characteristics of a synthetic jet issuing from a sharp-edged orifice (diverging-shaped orifice). The experiments are carried out for a varied range of opening angles of sharp-edged orifices (θ = 0°, 30°, 60°, 90°, and 120°), Reynolds number (Re = 3243–8143), different jet-to-surface spacings (z/d = 1–16), and for two different values of orifice thicknesses, t = 5 mm (t/d = 0.33) and 10 mm (t/d = 0.66). The hot-wire anemometry is used to study the flow characteristics of synthetic jet, while heat transfer characteristics are studied by using a thermal imaging technique. The time-averaged flow fields associated with sharp-edged orifices reveal that orifices with t = 5 mm and 10 mm exhibit saddle-backed and top-hat velocity profile shapes, respectively. The results show that for a square-edge orifice (θ = 0°), the heat transfer rate decreases with an increase in orifice plate thickness from 5 to 10 mm, while the opposite trend in heat transfer is observed with sharp-edged orifice. The heat transfer rate with a 10 mm thick sharp-edged orifice is higher than the 5 mm thick sharp-edged orifice for all the tested opening angles. Furthermore, the results also show that for sharp-edged orifices, the heat transfer rate increases with the increase in opening angle from θ = 0° to 60°, while it decreases with further increasing from θ = 60° to 120°. The maximum value of average Nusselt number (Nuavg) is obtained for θ = 60° for both the orifice thicknesses (t = 5 and 10 mm), and this effect is found to be more pronounced for t = 10 mm orifice. For sharp-edged orifice (θ = 60°), the maximum enhancement in Nuavg is found to be 12.66% and 23% higher for t = 5 mm and 10 mm, respectively, compared to the equivalent square-edged orifice (θ = 0°). The cause for variation in heat transfer rate with sharp-edged orifices is interpreted due to the effect of flow recirculation and mass flow rate. A correlation has been proposed for Nuavg as a function of different opening angles. The present finding is useful for the optimization of the synthetic jet geometrical parameters for the effective heat transfer rate.
{"title":"Experimental investigation of flow and thermal characteristics of synthetic jet issuing from sharp-edged orifices","authors":"P. Sharma, S. Sahu, H. Yadav","doi":"10.1080/08916152.2022.2105449","DOIUrl":"https://doi.org/10.1080/08916152.2022.2105449","url":null,"abstract":"ABSTRACT The present experimental study reports the flow and heat transfer characteristics of a synthetic jet issuing from a sharp-edged orifice (diverging-shaped orifice). The experiments are carried out for a varied range of opening angles of sharp-edged orifices (θ = 0°, 30°, 60°, 90°, and 120°), Reynolds number (Re = 3243–8143), different jet-to-surface spacings (z/d = 1–16), and for two different values of orifice thicknesses, t = 5 mm (t/d = 0.33) and 10 mm (t/d = 0.66). The hot-wire anemometry is used to study the flow characteristics of synthetic jet, while heat transfer characteristics are studied by using a thermal imaging technique. The time-averaged flow fields associated with sharp-edged orifices reveal that orifices with t = 5 mm and 10 mm exhibit saddle-backed and top-hat velocity profile shapes, respectively. The results show that for a square-edge orifice (θ = 0°), the heat transfer rate decreases with an increase in orifice plate thickness from 5 to 10 mm, while the opposite trend in heat transfer is observed with sharp-edged orifice. The heat transfer rate with a 10 mm thick sharp-edged orifice is higher than the 5 mm thick sharp-edged orifice for all the tested opening angles. Furthermore, the results also show that for sharp-edged orifices, the heat transfer rate increases with the increase in opening angle from θ = 0° to 60°, while it decreases with further increasing from θ = 60° to 120°. The maximum value of average Nusselt number (Nuavg) is obtained for θ = 60° for both the orifice thicknesses (t = 5 and 10 mm), and this effect is found to be more pronounced for t = 10 mm orifice. For sharp-edged orifice (θ = 60°), the maximum enhancement in Nuavg is found to be 12.66% and 23% higher for t = 5 mm and 10 mm, respectively, compared to the equivalent square-edged orifice (θ = 0°). The cause for variation in heat transfer rate with sharp-edged orifices is interpreted due to the effect of flow recirculation and mass flow rate. A correlation has been proposed for Nuavg as a function of different opening angles. The present finding is useful for the optimization of the synthetic jet geometrical parameters for the effective heat transfer rate.","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44980440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-04DOI: 10.1080/08916152.2022.2108525
Sachin Sharma, R. Das, Kishor Kulkarni
{"title":"Parametric optimization of solar air heater having sine wave baffles as turbulators","authors":"Sachin Sharma, R. Das, Kishor Kulkarni","doi":"10.1080/08916152.2022.2108525","DOIUrl":"https://doi.org/10.1080/08916152.2022.2108525","url":null,"abstract":"","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42465739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-01DOI: 10.1080/08916152.2022.2105986
M. Khoshvaght-Aliabadi, I. Rahmani, J. A. Esfahani
{"title":"Influences of twisted turbulators arrangements on heat transfer and airflow resistance over absorber plate of solar air heater","authors":"M. Khoshvaght-Aliabadi, I. Rahmani, J. A. Esfahani","doi":"10.1080/08916152.2022.2105986","DOIUrl":"https://doi.org/10.1080/08916152.2022.2105986","url":null,"abstract":"","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48872779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-31DOI: 10.1080/08916152.2022.2105987
Xihao Gao, Biao Li, Hui Sun, Jianxin Xu, Hua Wang
{"title":"Visualization of direct contact heat transfer process driven by continuous low-temperature heat source and its performance characterization","authors":"Xihao Gao, Biao Li, Hui Sun, Jianxin Xu, Hua Wang","doi":"10.1080/08916152.2022.2105987","DOIUrl":"https://doi.org/10.1080/08916152.2022.2105987","url":null,"abstract":"","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47764768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-27DOI: 10.1080/08916152.2022.2105451
Ho-Jong Lee, Jae-Hung Han
ABSTRACT An experimental investigation of the effect of random vibration on the melting behavior of a phase change material (PCM) and the thermal performance of a PCM-based heat sink is presented. While random vibration from 2 to 16 g rms for the frequency range from 15 to 2000 Hz was applied to a rectangular enclosure, which contains paraffin wax and the heat sink, a constant heat flux was imposed on the heat sink to melt the PCM. The experimental results showed that the random vibration has no effect on the melting behavior early in the melting process during which conduction is the primary mode of heat transfer. However, the random vibration significantly affected the melting behavior later in the process during which natural convection is the primary mode of heat transfer. The random vibration augmented heat transfer in the molten PCM and increased the Nusselt number, 1.56 times greater under the vibration of 16 g rms than without vibration. The augmented heat transfer accelerated PCM melting and delayed the rise in temperature of the heat sink. The time for the temperature of the heat sink to rise to a threshold increased as the intensity of random vibration increased, 5.9 times longer under the vibration of 16 g rms than without vibration.
{"title":"Experimental Study on the Melting Behavior of a Phase Change Material under Random Vibration","authors":"Ho-Jong Lee, Jae-Hung Han","doi":"10.1080/08916152.2022.2105451","DOIUrl":"https://doi.org/10.1080/08916152.2022.2105451","url":null,"abstract":"ABSTRACT An experimental investigation of the effect of random vibration on the melting behavior of a phase change material (PCM) and the thermal performance of a PCM-based heat sink is presented. While random vibration from 2 to 16 g rms for the frequency range from 15 to 2000 Hz was applied to a rectangular enclosure, which contains paraffin wax and the heat sink, a constant heat flux was imposed on the heat sink to melt the PCM. The experimental results showed that the random vibration has no effect on the melting behavior early in the melting process during which conduction is the primary mode of heat transfer. However, the random vibration significantly affected the melting behavior later in the process during which natural convection is the primary mode of heat transfer. The random vibration augmented heat transfer in the molten PCM and increased the Nusselt number, 1.56 times greater under the vibration of 16 g rms than without vibration. The augmented heat transfer accelerated PCM melting and delayed the rise in temperature of the heat sink. The time for the temperature of the heat sink to rise to a threshold increased as the intensity of random vibration increased, 5.9 times longer under the vibration of 16 g rms than without vibration.","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2022-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44640434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-21DOI: 10.1080/08916152.2022.2103211
Tingbo Hou, Danmin Xu, Ning Li, Zhengchu Wang
ABSTRACT Four kinds of microchannels with round grooves and ribs were designed: round grooves (round), round grooves and single–sided ribs (round–single), round grooves and odd-symmetric ribs (round–odd), and round grooves and doubly symmetric ribs (round–double). The effects of rib arrangement on the heat transfer performance of microchannels with round grooves and ribs were numerically investigated and then compared with the microchannel with no grooves or ribs. The heat transfer characteristics were analyzed and compared in accordance with the field synergy principle and entropy production. Results indicate that the heat transfer field of round and round–double microchannels exhibited the smallest synergy angle (α) and the best field synergy. The round–double microchannel produced the lowest entropy caused by heat transfer and had a minimal irreversible loss; thus, it exhibited the best heat transfer performance.
{"title":"Heat transfer performance of microchannels with round grooves and ribs based on field synergy principle and entropy production analysis","authors":"Tingbo Hou, Danmin Xu, Ning Li, Zhengchu Wang","doi":"10.1080/08916152.2022.2103211","DOIUrl":"https://doi.org/10.1080/08916152.2022.2103211","url":null,"abstract":"ABSTRACT Four kinds of microchannels with round grooves and ribs were designed: round grooves (round), round grooves and single–sided ribs (round–single), round grooves and odd-symmetric ribs (round–odd), and round grooves and doubly symmetric ribs (round–double). The effects of rib arrangement on the heat transfer performance of microchannels with round grooves and ribs were numerically investigated and then compared with the microchannel with no grooves or ribs. The heat transfer characteristics were analyzed and compared in accordance with the field synergy principle and entropy production. Results indicate that the heat transfer field of round and round–double microchannels exhibited the smallest synergy angle (α) and the best field synergy. The round–double microchannel produced the lowest entropy caused by heat transfer and had a minimal irreversible loss; thus, it exhibited the best heat transfer performance.","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2022-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49177386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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