Journal of Heat Transfer-transactions of The Asme最新文献

{"title":"Second-law Considerations in Monte Carlo Ray-trace and Discrete Green's Function Analysis of Coupled Radiation and Conduction Heat Transfer","authors":"B. Vick, J. Mahan, M. Yarahmadi, K. Priestley","doi":"10.1115/1.4062174","DOIUrl":"https://doi.org/10.1115/1.4062174","url":null,"abstract":"\u0000 A new generic Monte Carlo ray-trace (MCRT) engine for computing radiation distribution factors (RDFs) working in tandem with an efficient finite-volume formulation based on discrete Green's functions (DGFs) has facilitated solution of massive (thousands of nodes) coupled radiation and conduction heat transfer problems. The MCRT method produces RDFs whose accuracy depends on the number of rays traced per surface element and the number of surface elements. Solution of pure radiation problems using RDFs is unconditionally stable and the uncertainty of results obtained is well documented in the literature. However, when RDFs are used in conjunction with time-dependent finite-volume conduction formulations based on DGFs, errors result due to local violations of the second law of thermodynamics related to small imbalances in RDF reciprocity. Described is a novel approach to eliminating RDF reciprocity imbalances without violating the first law of thermodynamics. The approach is demonstrated for dynamic thermal analysis of an Earth radiation budget instrument concept composed of 2636 surface elements and a similar number of volume elements.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91362280","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}

{"title":"Heat Transfer Intensification of a Confined Impinging Air Jet via a Guiding Baffle","authors":"Hussein M. Maghrabie, M. Attalla, Mustafa Abdelfattah","doi":"10.1115/1.4057051","DOIUrl":"https://doi.org/10.1115/1.4057051","url":null,"abstract":"\u0000 The heat transfer intensification of a confined imping jet was achieved using rough surface, pin fines as well as using modified nozzle such as chamfering, chevron, sweeping, swirling, etc. In the current work, the enhanced cooling process utilizing a single confined air jet impinged on a flat plate using a guiding baffle is implemented. The impacts of Reynolds number (Re) ranged from 500 to 5000, guiding baffle diameter-to-nozzle diameter (D/d) of 2, 4, and 6, and guiding baffle height-to-nozzle to impinging plate distance (h/H) of 1/3, 1/2, and 3/4 on the cooling process are studied. The distributions of surface temperature are acquired experimentally using the thermal infrared camera. As well, the local Nusselt number,(Nu) stagnation Nusselt number (Nu¯st), average Nusselt number,(Nu¯) and average Nusselt number ratio (Nur¯) are evaluated. The results reveal that the enhancement of heat transfer is achieved due to installing a baffle with a D/d of 2 for all values of baffle height and Reynolds number. In addition, the (Nur¯) is increased with increasing the Re in the range from 500 to 2500, then it is decreased by a further increase in in Re. Moreover, based on the experimental results, an empirical correction is proposed to compute (Nu¯) the average Nusselt number depending on Re, D/d, and h/H with a ± 2.65% standard deviation.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75006750","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}

{"title":"Modulation of Heat Transfer in a Porous Burner Based On Triply Periodic Minimal Surface","authors":"Zhilong Cheng, Song Li, Wei Chen, Qiuwan Wang","doi":"10.1115/1.4057023","DOIUrl":"https://doi.org/10.1115/1.4057023","url":null,"abstract":"\u0000 The list of reacting flow in porous media applications is quite long, including porous media combustion, syngas production, and fuel cells. Porous media combustion is recognized as a cutting-edge combustion technique for increasing flammability. In this process, heat is transferred from the exothermic reaction zone to the incoming reactants through porous media. This role of porous media distinguishes reacting flow in porous media from free combustion processes. Local heat transfer, such as solid conduction, solid-solid radiation, and solid-gas convection, as well as the response behavior, are by the topology of the porous material. Theoretical studies indicate that continuously graded porous materials can significantly enhance the performance benefits of heat transfer. However, topology design is challenging for smooth graded porous media, and thus investigations of combustion within graded porous media are still required. In the present study, we constructed a porous structure of type W/P/D/G (porosity e = 0.3-0.5, hydraulic diameter dh = 1.33-3.86 mm) using a triply periodic minimal surface (TPMS), and a computational model of the combustion reaction in porous media was established to compare the range of flame stability within different pore types. In addition, topology gradation was achieved via TPMS to modulate the heat transfer to ensure the dependable functioning of premixed flames and improved heat recirculation. Heat transfer in the graded TPMS-based porous structure was analyzed numerically. The conclusions obtained from this study can effectively address the aforementioned challenges related to porous media burner design.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81746529","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}

{"title":"Numerical Study of a Non-Linear Porous Sublimation Problem with Temperature-Dependent Thermal Conductivity and Concentration-Dependent Mass Diffusivity","authors":"Vikas Chaurasiya, Ankur Jain, J. Singh","doi":"10.1115/1.4057024","DOIUrl":"https://doi.org/10.1115/1.4057024","url":null,"abstract":"\u0000 Sublimation heat transfer occurs in a wide range of engineering processes such as Accelerated Freeze Drying, energy storage and food technology. Particularly, in microwave AFD process, preservation of material with least possible energy consumption is desirable. In connection with this, it is of interest to analyze the effect of temperature/concentration dependent heat/mass transfer properties. Given the limited literature available on sublimation, there is a general lack of physical understanding of this particular problem. The present work analyses non-linear sublimation process driven by convective heat/mass transfer and evaporation of water vapor using the Legendre wavelet-collocation method. Results from the present work are shown to be in excellent agreement with the exact solution of special case of a linear problem. Further, present numerical technique shows strong acceptance with finite-difference method in case of full non-linear model. The model is used for a comprehensive investigation of the impact of problem parameters appearing in this study on the rate of sublimation. It is found that sublimation rate increases with increasing values of ß1 and decreasing values of ß2. The impact of other dimensionless problem parameters such as Peclet numbers Pe1 and Pem, convection due to moisture flow of water vapor ß, latent heat of sublimation l0 and Luikov number Lu on sublimation process is also discussed in detail. These observations offer a comprehensive theoretical and mathematical understanding of sublimation heat/mass transfer under practical conditions for improving the performance and efficiency of freeze-drying related engineering processes.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84653156","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}

{"title":"A Machine Learning Approach to Model Oxidation of Toluene in a Bubble Column Reactor","authors":"Raihan Tayeb, Yuwen Zhang","doi":"10.1115/1.4057022","DOIUrl":"https://doi.org/10.1115/1.4057022","url":null,"abstract":"\u0000 A machine-learned (ML) subgrid-scale (SGS) modeling technique is introduced for efficient and accurate prediction of reactants and products undergoing parallel competitive reactions in a bubble column. The model relies on data generated from a simple substitute problem with a small number of features. The machine-learned model replaces the iterative approach associated with the use of analytical profiles for previous subgrid-scale models for correcting concentration profiles in boundary layers. The present model, thus, offers a significant performance bonus as well as the flexibility to extend to more complex scenarios due to its data-driven nature.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73914942","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}

{"title":"New Insights in Turbulent Heat Transfer with Oil and Hybrid Nano-Oils, Subject to Discrete Heating, for Parabolic Trough Absorbers","authors":"S. Upadhyay, L. Chandra, J. Sarkar","doi":"10.1115/1.4057025","DOIUrl":"https://doi.org/10.1115/1.4057025","url":null,"abstract":"\u0000 The concentrated solar thermal systems, operating in the medium temperature range 373 - 573 K, will be extremely useful for several industrial processes. However, the need for an in-depth understanding of the turbulent heat transfer in parabolic trough absorbers with pure and hybrid nano-oils, including the effect of buoyancy or gravity, is realized. This paper presents the RANS-based turbulent heat transfer analyses in a 3D, long, straight for Reynolds number from 5000 to 20000 and discrete heating conditions with different heat flux ratios such as 1, 5, 10, 20, 40, and 50 for pure oil and hybrid nano-oils having 1, 4 and 6 % volume concentration of the nanoparticles. The major findings are, (a) gravity-induced anisotropy leads to high and low-speed fluid flows near the lower and upper walls and temperature redistribution at a plane, which is beneficial, (b) the statistical axial-velocity deviates from the standard logarithmic law at a Reynolds number of 5000, and (c) the ratio of surface-area-averaged Nusselt number between the lower half and upper half of the tube is 4-12. Some important recommendations are (a) the effect of gravity must be included, (b) the local Richardson number may be used for improving the standard logarithmic law for the axial velocity, and (c) Nusselt number correlations are deduced for the upper half surface and lower half surfaces. The findings, albeit for limited parameters, will be useful for improving the heat transfer aspects in the parabolic trough absorber.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86824758","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}

{"title":"Individual Effect of Spatially-Periodic Vertical Surface Temperatures And Nanoparticles On Natural Convection In Water","authors":"M. Narayana, Richa Saha, P. Siddheshwar, S. S. Nagouda","doi":"10.1115/1.4056922","DOIUrl":"https://doi.org/10.1115/1.4056922","url":null,"abstract":"\u0000 This paper considers the thermo-convective boundary-layer flow (BLF) of a water-copper mono-nanofluid over a flat vertical surface which is subjected to three types of periodic temperature variations described by the sinusoidal, sawtooth and triangular waveforms. The temperature of the fluid at the flat surface is greater than the surrounding ambient temperature. The governing equations describing the BLF have been reduced to a non-similar form using an appropriate stream function formulation. The Keller-Box method is used to obtain numerical solution of the boundary-value problem. The effect of the pertinent parameters on the nature of the flow and the heat transfer has been discussed using actual thermophysical data. The results about the shear-stress and heat transfer rate at the surface are presented as well. To study the nature of BLF, the velocity and thermal boundary-layers, the streamline and isotherm plots have been considered, which reveal that the nanoparticle volume-fraction, amplitude of surface temperature variations and the Grashof number play a pivotal role in enhancing/diminishing heat transfer. The final outcome reveals that the heat transfer is highest for the sinusoidal waveform, followed by that of the triangular and then, the sawtooth. An important inference is that a symmetric periodic temperature distribution at the surface enhances heat transfer more than that of a constant surface-temperature.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82621770","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}

{"title":"Reviewer's Recognition","authors":"","doi":"10.1115/1.4056754","DOIUrl":"https://doi.org/10.1115/1.4056754","url":null,"abstract":"The Reviewers of the Year Award is given to reviewers who have made an outstanding contribution to the journal in terms of the quantity, quality, and turnaround time of reviews completed during the past 12 months. The prize includes a Wall Plaque, 50 free downloads from the ASME Digital Collection, and a one year free subscription to the journal.R. AbdelmaksoudH. Abdelmotalib AhmedL. AbreuS. AcharyaS. AderaB. AinaV. AjaevM. AlqeflL. AlvesB. AnM. AndoA. AvramenkoC. BalajiR. BallariniD. BanerjeeH. BaoA. BarikA. BarlettaN. BasuS. BayraktarM. BenedettiJ. BennerD. BhanjaA. BhattacharyaS. BhavnaniV. BiancoG. BiswasM. BlythD. Borca-TasciucD. CalamasC. CamciA. CandadaiZ. CaoD. CarringtonL. CattaniM. CelliD. ChatterjeeV. ChauhanT. ChenX. ChenY.-B. ChenY. ChenP. CoelhoR. CottaS. CuiP. CumberV. D'AlessandroX. DaiS. DashK. DaunG. DayyabuR. DevireddyV. DhirY. DiaoC. DinhB. DogruozL. DombrovskyC. A. DoraoX. DuF. DuanX. DuanP. DuttaS. EkkadA. El MansouriS. ElbelF. ErchiquiM. Erfanian NakhchiB. EvansO. EzekoyeL. FanP. FaroukM. FatehA. FedorovT. FengT. FisherE. Fornalik-WajsD. FranceR. FrederickM. FriestadB. FronkR. GangulyD. GargS. GarimellaM. GartiaS. GhiaasiaanP. GhoshS. Ghosh MoulicP. S. GhoshdastidarH. GilbertB.J. GireeshaL. GlicksmanV. GoelA. GogineniL. GongJ. GoreG. GraeberC. GreenA. GuptaA. GuptaV. GuptaJ. HanM. HaqueH. HeM. HodesY. HuH. HuangA. HusseinB. IversonR. IwataV. IyerA. JacobiG. JacobsA. JainA. JainJ. JalilY. JaluriaL. JinH. JinA. JoardarC. JogM. JogM. JonesG. JonesY. JoshiA. KabeelH. KahalerrasH. KahveciS. KandlikarH. KangG. KaramanisA. KassabS. KedukodiM. KedzierskiU. KemerliR. KempersK. KeniarC. KharangateH. KimT. KimL. KleinW. KlinbunA. KoonsrisukK. KotaR. KovacsU. KoyluD. KrasnovA. KrishnaS. KrishnanF. Sunil KumarP. KumarR. KumarS. KumarS. KumarS. KwarkJ. LageL. LamA. LavineR. LewisD. LiX. LiT. LiX. LiY. LiZ. LiY. LianY. LiaoJ. LienhardA. LimiaA. LinJ. LiuL. LiuZ. LiuJ. LukesS. LynchG. LyraM. MB. MaG. MadireddyJ. MahanD. MaillerO. MancaT. MancusoS. ManoharanM. MarengoL. MaroccoS. MarooN. MassarottiO. MatteiS. MazumderR. McMastersZ. MehrezM. MengucN. MiljkovicM. MisaleA. MishraP. MishraD. MoD. ModestA. MohamadM. MollaP. MondalR. MoradiG. MorenoA. MorrisA. MukherjeeK. MuralidharA. MurataY. MuzychkaV. NairA. NarainA. NarasimhanS. NarayananR. NarayananS. NardiniS. NarumanchiA. NayakK. NgA. NiroZ. NiuH. OrlandeN. OzalpC. PachecoL. PagliariniJ. PalkoC. PanZ. PanK. PanchalJ. PanditC. PantR. PaoliE. PapanicolaouA. PatilS. PatilY. PelesA. PerumalP. PhelanJ. PhilipA. PickelD. PillaiL. PilonI. PopR. PrasherD. PriyankaM. QasimH. QiZ. QinA. QuintinoR. RajS. RajendranC. RajuJ. RamboB. Ramos AlvaradoM. RaoW. RaoA. RashadD. ReesM. Risso ErreraN. RobertsB. RuanK. RykaczewskiA. SadaghianiS. SadhalS. SahaR. SalaryI. SarrisA. SasmitoV. SathyamurthiE. SewallC. SewatkarM. ShafahiP. ShambergerJ. ShanY. ShenM. SheremetI. ShevchukD. ShinS. ShinG. ShitR. ShuklaP. SiddheshwarS. SiddiqaM. SiegelA. Silva NetoA. SinghP. SinghS. SinghM. SmithS. SobhaniA. SommersL. Sphaie","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136176832","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}

{"title":"Investigation of Conjugate Effects on Forced Convection in Diamond (Diverging–Converging) Microchannels","authors":"S. Goli, Sandip K. Saha, A. Agrawal","doi":"10.1115/1.4056691","DOIUrl":"https://doi.org/10.1115/1.4056691","url":null,"abstract":"\u0000 A three-dimensional solid–fluid conjugate model is employed to provide physical insights into the effect of wall conduction on fluid convection in a diamond-shaped microchannel. The study covers the effect of divergence-convergence angle, width ratio, thermal conductivity ratio, thickness ratio, and Reynolds number on peripheral heat flux, temperature, and Nusselt number profiles. Isotherms show a multidirectional thermal gradient for low thermal conductivity ratios, whereas only an axial thermal gradient is seen for higher thermal conductivity ratios. Furthermore, the overall axial surface temperature gradients decrease with increasing divergence-convergence angle and decreasing width ratio. The study also shows that the thermal conductivity ratio significantly influences the Nusselt number, while the thickness ratio has only a moderate influence for all geometries. The analysis also reveals that at a particular intermediate thermal conductivity ratio, the Nusselt number becomes maximum. Lastly, a nondimensional wall conduction number is used to characterize conjugate effects in diamond microchannels. The wall conduction effect is inconsequential in diamond microchannels when the nondimensional wall conduction number is less than 0.01. The present study is beneficial from a practical perspective as it helps design the optimum channel geometries subjected to conjugate effects for many heat transfer applications.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82273435","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}

{"title":"Effects of Rough Boundaries on Rayleigh–Bénard Convection in Nanofluids","authors":"H. Firdose, P. Siddheshwar, Ruwaidiah Idris","doi":"10.1115/1.4056661","DOIUrl":"https://doi.org/10.1115/1.4056661","url":null,"abstract":"\u0000 A linear stability analysis of Rayleigh–Bénard convection in a Newtonian nanofluid is carried out using most general boundary conditions. A single-phase description of nanofluids is adopted in the study. The nanofluids used for the study are water–alumina and water–copper nanofluids in order to analyze how a choice between them can be made. The values of thermophysical quantities of nanofluids are calculated using the mixture theory and phenomenological-laws. The paper applies the Maclaurin series in solving the boundary-eigenvalue-problem through a simple and innovative approach. A single-term Galerkin technique is adopted to obtain the guess value of the critical Rayleigh number and the wave number. Further, improved values of the Rayleigh number and the wave number are obtained using the solution of a system of three linear-algebraic equations. A detailed discussion is made on the effect of rough-boundaries and Robin-boundary conditions for temperature on the onset of convection. A comparative study between the results of two nanofluids is made and the destabilizing effect of nanoparticles in the Newtonian carrier-fluid on the onset of convection is studied.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89256883","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}