Experimental Heat Transfer最新文献

{"title":"Performance improvement of solar air heater duct-employing rib roughness on absorber: an experimental study","authors":"Ravi Kant, Tabish Alam, Dheerandra Singh, Ahmed Sabeeh","doi":"10.1080/08916152.2023.2268080","DOIUrl":"https://doi.org/10.1080/08916152.2023.2268080","url":null,"abstract":"ABSTRACTSolar energy is a pure and plentiful source of power for daily activities. Out of many solar thermal system, Solar air heaters (SAHs) are frequently regarded as the most economical and practical method of heating and drying indoor spaces. Due to its poor performance and minimal heat transfer capacity, its applicability in certain circumstances is quite limited. In this paper, an effort has been made to improve the heat transfer efficiency of SAH by utilizing hybrid ribs. Hybrid rib roughnesses are designed to integrate V-shaped ribs downstream of arc-shaped ribs and were experimentally tested in the SAH duct at Reynolds numbers (RN) between 2000 and 16,000. The various roughness pattern i.e. arc angle (α), relative V ribs position (d/w), relative rib pitch (p/e) and relative rib height (e/Dh) have been exploited in the range of 30º-75º, 0.2–0.8, 8–14 and 0.036–0.056, respectively. As a result, maximum enhancement in NuNu has been found as 3.75 at α = 45º, d/w = 0.5, p/e = 12, e/D = 0.056. Thermohydraulic Performance (TP) parameters have also been evaluated for all set of parameters and it was found to be maximum 2.49 at α = 45º, d/w = 0.5, p/e = 12, and e/Dh = 0.036.KEYWORDS: Solar air heaterheat transfer enhancementthermohydraulic performancehybrid-shaped ribs AcknowledgmentsThis work is carried out under Indo-US Project (GAP-806). Also, this work form the dissertation of the First Author.Disclosure statementNo potential conflict of interest was reported by the author(s).Highlights Hybrid rib roughnesses pattern incorporating to V-shaped ribs and arc-shaped ribs has been designed and tested experimentally in the solar air heater duct.The various roughness pattern i.e. arc angle (α), angle of attack (β), relative V ribs position (d/w), relative rib pitch (p/e) and relative rib height (e/D) have been exploited in the range of 30º-75º, 30º-75º, 0.2-0.10, 8-10, and 0.023-0.043, respectively.Maximum enhancement in NuNu has been found as 3.75 at α = 45º, β = 60º, d/w = 0.65, p/e = 10, e/D = 0.043.Thermohydraulic Performance (TP) parameters have also been evaluated for all set of parameters of hybrid ribs pattern and it found to be maximum 2.49 at α = 30º, β = 60º, d/w = 1.0, p/e = 10, e/D = 0.043.","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136295065","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":"Turbulent flow-driven liquid-solid mass transfer in serpentine tube heat exchanger/reactors: applications and implications","authors":"A. S. Fathalla, H. M. Yassine, S. A. Nosier, M. H. Abdel-Aziz, G. H. Sedahmed, M. A. El-Naggar","doi":"10.1080/08916152.2023.2268055","DOIUrl":"https://doi.org/10.1080/08916152.2023.2268055","url":null,"abstract":"ABSTRACTThis study examines liquid-solid mass and heat transfer rates in serpentine tube heat exchangers/reactors under turbulent flow using the copper dissolution technique. Key factors include solution flow rate, properties, tube diameter, U-bend curvature, and drag-reducing polymers. An empirical correlation predicts mass transfer coefficients, which are 4.12–5.36 times higher than straight tubes. Serpentine tubes show potential for economically viable diffusion-controlled reactions. Drag-reducing polymer (Polyox WSR-301) reduces corrosion rates by up to 23.3%. The study highlights serpentine tubes’ applicability in catalytic continuous reactors and membrane processes, emphasizing their significance in heat exchanger design and corrosion allowance prediction.KEYWORDS: Batch recycle reactordrag-reducing polymerheat exchanger/reactormembrane separationsecondary flowserpentine tubes Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThe data that support the findings of this study are available from the corresponding author upon reasonable request.","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136294924","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":"Thermohydraulic performance of hybrid ribs pattern combining V and arc shape ribs in solar air heater","authors":"Tabish Alam, Deepak Gupta","doi":"10.1080/08916152.2023.2260378","DOIUrl":"https://doi.org/10.1080/08916152.2023.2260378","url":null,"abstract":"ABSTRACTSolar energy is a limitless and ecological-friendly renewable energy source, which can be utilized for varieties of application ranging from heating/cooling, power generation, drying, and in heat-processing industries. Solar air heaters (SAHs) are among the best options for harnessing solar energy for thermal purposes like heating and drying. However, the performance of SAH is not sufficient to take into practical applications. Low performance of SAH is due to its low convective heat transfer capability because of smooth absorber plate. In this regard, an attempt has been made to enhance the heat transfer capability of SAH exploiting hybrid ribs in this paper. Hybrid rib roughness pattern incorporating to V shape ribs and arc shape ribs has been designed and tested experimentally in the SAH duct under the following range of Reynolds number (Re) from 2000 to 16,000. The various roughness patterns, i.e., arc angle (α), angle of attack (β), relative V ribs position (d/w), relative rib pitch (p/e), and relative rib height (e/D), have been exploited in the range of 30º-75º, 30º-75º, 0.2–0.10, 8–10, and 0.023–0.043, respectively. As a result, Nusselt number (Nu) and friction factor (f) have been enhanced significantly. Maximum enhancement in Nu has been found as 3.08 at α = 45º, β = 60º, d/w = 0.65, p/e = 10, and e/D = 0.043. Thermohydraulic performance (TP) parameters have also been evaluated for all set of parameters of hybrid ribs pattern and it found to be maximum 2.18 at α = 30º, β = 60º, d/w = 1.0, p/e = 10, and e/D = 0.043.KEYWORDS: Thermohydraulic performancehybrid ribs patternsolar air heaternusselt number AcknowledgmentsThis work is carried out under Indo-US Project (GAP-806).Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136315036","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 study of the thermal characteristic of a double tube heat exchanger with tapered wire coil inserts using PCM-dispersed mono/hybrid nanofluids","authors":"Sumit Kr. Singh, Vivek Kumar, Amit Kumar, Sujeet Yadav","doi":"10.1080/08916152.2023.2256315","DOIUrl":"https://doi.org/10.1080/08916152.2023.2256315","url":null,"abstract":"ABSTRACTAn experimental study involving tapered wire coil inserts in a double-tube heat exchanger using water-based phase change material (PCM)-dispersed mono/hybrid nanofluids is conducted. The effects of the wire coils (WC) with nanofluids on the hydrothermal performance of this system are studied for different coil arrangements: converging wire coils (CWC), diverging wire coils (DWC), and converging-diverging wire coils (CDWC) and different Reynolds numbers. The experimental results indicate that among all the tested coil arrangements, the DWC presents a higher thermal performance factor (TPF) than the other arrangements. Using the DWC, the TPF of the Al2O3+PCM hybrid nanofluid is augmented by 3.98%, 9.61%, and 3.04% as compared to that for the plain wire coil (PWC), CWC, and CDWC, respectively. Besides, the DWC configuration exhibits the minimum entropy generation among all arrangements. For the Al2O3+PCM hybrid nanofluid using the DWC, the entropy generation is decreased by approximately 13.36%, 9.78%, and 5.78% as compared to that of the PWC, CWC, and CDWC at a volumetric flow rate of 15 lpm.KEYWORDS: Nanofluidstapered wire coildouble tube heat exchangerheat transfer enhancemententropy generationenergy efficiency Nomenclatures CWC=Converging wire coilCDWC=Converging-diverging wire coilDWC=Diverging wire coilcp=Specific heat (J/kg.K)d=Diameter (m)r=Radius (m)DWC=Diverging wire coilf=Friction factorh=Heat transfer coefficient (W/m2.K)k=Thermal conductivity (W/m.K)L=Tube length (m)m=Mass flow rate (kg/s)Nu=Nusselt numberΔp=Pressure lose (Pa)Pr=Prandtl numberQ=Heat transfer rate (W)Re=Reynolds numberS=Entropy (W/K)T=Temperature (K)Φ=Volume concentration (%)µ=Dynamic viscosity (Pa.s)ρ=Density (kg/m3)Subscripts=avg=Averagegen=Generationeq=Equivalenth, nf=Hot, nanofluidht=Convective heat transfer coefficienti, o=Inner, outerin, out=Inlet, outletnp=Nanoparticleit, ot=Inner tube, outer tubetot=TotalDisclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134969931","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 on heat transfer characteristics of upward flow boiling in a vertical narrow rectangular channel","authors":"Cheng Jin, Leren Tao, Yiwei Ju, Xiefei Zhao, Shengjie Gu, Lihao Huang","doi":"10.1080/08916152.2023.2252810","DOIUrl":"https://doi.org/10.1080/08916152.2023.2252810","url":null,"abstract":"Heat transfer experiment on water flow boiling was carried out in the upward direction under atmospheric pressure through a narrow rectangular channel heated on one-side by vapor having a gap of 2.75 mm, a width of 250 mm, and length of 1400 mm. The heat transfer coefficient and thermal hydraulic thresholds of the flow boiling in forced convective flow, such as the onset of nucleate boiling (ONB) and onset of fully developed nucleate boiling (OFDB) were investigated. The experiment was performed over a wide range of inlet temperature (75–95°C), mass flow rate (2–9 g/m), and heat fluxes (5–16 kW/m2). The effects of the parameters on the heat transfer coefficients have been discussed in detail. A series of ONB, FDB and heat transfer correlations were evaluated using the experimental data, and most of the correlations did not adequately fit the experimental results. A modified Hong et al. correlation and modified Zhu et al. correlation were used to predict the wall superheat at ONB and FDB respectively. The average errors (AEs) of the two correlations were 2.36% and −0.68%, and the root mean square errors (RMSEs) of them were both 14.00%. A modified Li and Wu correlation was used to predict heat transfer coefficients with the average error (AE) of 1.46% and the root mean square errors (RMSE) of 11.88%.","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135734954","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 and numerical simulation-based investigation for thermal characteristic of frustum roughened solar air heater","authors":"Dharam Singh, Vikash Kumar","doi":"10.1080/08916152.2023.2249881","DOIUrl":"https://doi.org/10.1080/08916152.2023.2249881","url":null,"abstract":"","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46279777","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":"An experimental investigation on the thermal behavior of synthetic jets involving non-circular orifices with varying wave patterns","authors":"Pushpanjay K. Singh, P. K. Upadhyay, H. Yadav, S. Sahu","doi":"10.1080/08916152.2023.2248475","DOIUrl":"https://doi.org/10.1080/08916152.2023.2248475","url":null,"abstract":"","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42315091","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":"Application of Taguchi method and response surface methodology (RSM) for parametric optimization of natural convection heat transfer inside a triangular porous enclosure with in-line rectangular finned array","authors":"D. Das, Abhishek, P. Sharma","doi":"10.1080/08916152.2023.2246974","DOIUrl":"https://doi.org/10.1080/08916152.2023.2246974","url":null,"abstract":"","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43379981","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":"Investigation of free convection heat transfer from vertical cylinders with semicircular fins","authors":"Yousif Hashim Hussein, Abdulrazzak Akroot, T. A. Tahseen","doi":"10.1080/08916152.2023.2240805","DOIUrl":"https://doi.org/10.1080/08916152.2023.2240805","url":null,"abstract":"","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49615046","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":"An experimental investigation on the performance of designed closed reactor system on the thermochemical heat storage of magnesium chloride hexahydrate","authors":"A. A. Hawwash, Shinsuke Mori, Hamdy Hassan","doi":"10.1080/08916152.2023.2240807","DOIUrl":"https://doi.org/10.1080/08916152.2023.2240807","url":null,"abstract":"","PeriodicalId":12091,"journal":{"name":"Experimental Heat Transfer","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49511483","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}