Academic literature on the topic 'Slag heat exchange'
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Journal articles on the topic "Slag heat exchange"
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Kolczyk, E., Z. Miczkowski, and J. Czernecki. "Numerical investigation of heat exchange in rotary furnace." Archives of Metallurgy and Materials 62, no. 1 (March 1, 2017): 149–53. http://dx.doi.org/10.1515/amm-2017-0020.
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Abstract Process of heat exchange in a rotary furnace during converter slag reduction was modelled.Temperature distribution in the furnace and temperature of the charge (slag) only were examined. Influence of modification of the process gas supply method by changing the number of nozzles on the course of the reduction process was analyzed. It has been found out that application of a nozzle as a submerged flame burner provides possibilities to reach higher charge temperature. Application of more nozzles in the process of converter slag reduction can increase temperature of reduced slag and provide better uniformity of charge heating.
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Chaulet, Jérémy, Abdellah Kharicha, Sylvain Charmond, Bernard Dussoubs, Stéphane Hans, Menghuai Wu, Andreas Ludwig, and Alain Jardy. "A 2D Multiphase Model of Drop Behavior during Electroslag Remelting." Metals 10, no. 4 (April 8, 2020): 490. http://dx.doi.org/10.3390/met10040490.
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Electroslag remelting is a process extensively used to produce metallic ingots with high quality standards. During the remelting operation, liquid metal droplets fall from the electrode through the liquid slag before entering the liquid pool of the secondary ingot. To better understand the process and help to optimize the operating condition choice, a 2D axisymmetric multiphase model of the slag domain has been developed using a two fluid Eulerian approach. During their fall, droplets hydrodynamic interactions are calculated thanks to an appropriate drag law. Influence of droplets on the electromagnetic field and on the slag hydrodynamics is discussed, as well as their heat exchange with the slag. Even with a small volume fraction, the droplets influence is noticeable. The present investigation shows that small droplets have a large influence on the slag hydrodynamics, due to a great momentum exchange. However heat transfer is more influenced by large drops, which are found to be relatively far from the thermal equilibrium with the slag phase.
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Kolczyk, Ewa, Zdzisław Miczkowski, and Józef Czernecki. "Influence of selected parameters on phenomena of two-phase flow and heat exchange in TSL furnace – numerical investigation." International Journal of Numerical Methods for Heat & Fluid Flow 27, no. 12 (December 4, 2017): 2799–815. http://dx.doi.org/10.1108/hff-02-2017-0053.
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Purpose The purpose of this study is application of a numerical simulation for determination of the influence of geometric parameters of a furnace and hydrodynamics of the gas introduced by a vertical submerged lance on the process of feed mixing and temperature distribution. Design/methodology/approach A numerical simulation with Phoenics software was applied for modeling of liquid phase movement and heat exchange between the gas supplied through a lance and the slag feed in a top submerged lance (TSL) furnace. The simulation of a two-phase flow of a slag–gas mixture based on the inter phase slip algorithm module was conducted. The influence of selected parameters, such as depth of lance submergence, gas flow rate and change of furnace geometry, on the phenomena of movement was studied. Findings Growth of dynamics of mixing with the depth of lance submergence and with increase of gas velocity in the lance was observed. Formation of a recirculation zone in the liquid slag was registered. Movement of the slag caused by the gas flow brought homogenization of the temperature field. Originality/value The study applied the simulation of a two-phase flow in the liquid slag–gas system in steady state, taking into account heat transfer between phases. It provides possibilities for optimization and selection of process parameters within the scope of the developed new technology using a TSL furnace.
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Синицын, Н. Н., Н. В. Запатрина, and Ю. В. Донцова. "MATHEMATICAL MODEL FOR PREDICTING HEAT EXCHANGE OF A SINGLE BLAST OF FURNACE SLAG DROPLET IN UNSTEADY MOTION IN A COUNTER GAS FLOW." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА, no. 3(-) (August 15, 2022): 30–38. http://dx.doi.org/10.36622/vstu.2022.18.3.003.
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Cухая грануляция доменного шлака, в отличие от мокрой грануляции, позволяет утилизировать физическую теплоту жидкого доменного шлака, выход которого составляет 0.3 … 0.35 т на т чугуна, а также исключить образование вредных газообразных сернистых соединений. При проектировании опытно-промышленных установoк сухой грануляции доменного шлака необходимы инженерные методики, позволяющие рассчитывать характерные размеры грануляционной камеры, а именно: диаметр и высоту, позволяющие исключить налипание капель жидкого доменного шлака на стенки камеры. До столкновения со стенкой капли доменного шлака должны затвердеть. Pазработана математическая модель охлаждения одиночной капли жидкого доменного шлака при неустановившемся движении вo встречном потоке газа с учетом фазового перехода доменного шлака. Решение дифференциального уравнения теплопроводности осуществлено методом конечных разностей по явной схеме аппроксимации производных. Фазовый переход учитывается с помощью эффективной теплоемкости. При этом температура фазового перехода размазывается в некотором интервале температур. Граница перехода шлака из жидкого состояния в твердое определяeтся по температуре фазового перехода доменного шлака. При тестировании алгоритма определяются настроечные параметры модели: число узлов расчетной сетки и температурный интервал фазового перехода доменного шлака. Скорость движения капли доменного шлака во встречном потоке газа описывается системой обыкновенных дифференциальных уравнений, решение которых осуществлялось численным методом Рунге-Кутта, с последующим определением относительной скорости капли и коэффициента теплоотдачи в каждый момент времени. Представлены траектории движения капли доменного шлака до момента полной остановки в горизонтальном направлении и температурные поля по сечению капли в момент остановки. Разработан алгоритм расчета теплообмена капли при ее движении во встречном газовом потоке. Математическая модель теплообмена капли доменного шлака при ее движении во встречном охлаждающем газовом потоке позволяет прогнозировать поведение капель в грануляционной камере и спрогнозировать характерные ее размеры Dry granulation of blast furnace slag, unlike wet granulation, makes it possible to utilize the physical heat of liquid blast furnace slag, the yield of which is 0.3 ... 0.35 t per t of iron, as well as to exclude the formation of harmful gaseous sulfur compounds. When designing pilot plants for dry granulation of blast-furnace slag, engineering methods are needed to calculate the characteristic dimensions of the granulation chamber, namely the diameter and height to exclude the adhesion of liquid blast-furnace slag droplets to the chamber walls. Before colliding with the wall, the blast furnace slag droplets must solidify. In this paper, we developed a mathematical model for cooling a single drop of liquid blast furnace slag in unsteady motion in a counter gas flow with consideration of the phase transition of blast furnace slag. The differential equation of heat conduction is solved by the finite difference method, according to the explicit derivative approximation scheme. The phase transition is taken into account by means of effective heat capacity. In this case, the phase transition temperature is smeared out in some temperature interval. The slag transition boundary from liquid to solid state is determined by the blast furnace slag phase transition temperature. When testing the algorithm, we determined the model settings: the number of calculation grid nodes and the blast furnace slag phase transition temperature interval. The velocity of blast-furnace slag droplet in the counter gas flow is described by the system of ordinary differential equations, solved by numerical Runge-Kutta method, followed by determination of the droplet relative velocity and heat transfer coefficient at each moment of time. We presented the trajectories of blast furnace slag droplet motion up to the moment of complete stop in the horizontal direction and temperature fields along the droplet cross section at the moment of stop. We developed an algorithm for calculating the heat exchange of the droplet as it moves in the counter gas flow. Mathematical model of heat exchange of blast furnace slag droplet during its movement in the counter cooling gas flow makes it possible to predict the droplet behavior in the pelletizing chamber and to predict its characteristic sizes
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Lukin, S. V., N. I. Shestakov, and E. M. Il’icheva. "Heat Exchange in the Granulation Chamber of an Installation for Slag Dry Granulation." Metallurgist 63, no. 7-8 (November 2019): 804–12. http://dx.doi.org/10.1007/s11015-019-00892-x.
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Bruckner, Adam P. "Continuous duty solar coal gasification system using molten slag and direct-contact heat exchange." Solar Energy 34, no. 3 (1985): 239–47. http://dx.doi.org/10.1016/0038-092x(85)90061-1.
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Spirin, N. A., O. P. Onorin, A. S. Istomin, and I. A. Gurin. "Study of transient processes in a blast furnace based on the heat exchange scheme analysis." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 76, no. 2 (March 19, 2020): 132–38. http://dx.doi.org/10.32339/0135-5910-2020-2-132-138.
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A blast furnace is a complicated metallurgical facility, which is characterized by considerable delay and inertia in the flow of heat and mass exchange. Therefore, the analysis of transient processes based on modern ideas about heat transfer is an important issue in solving technological problems of blast furnace smelting managing. A two-stage heat transfer scheme along the height of a blast furnace of modern technology presented. When studying the thermal state of a blast furnace as a control object, it is advisable to divide it into two thermal zones - the upper zone and the lower zone. The border between the zones is located in the upper part of the mixed reduction region, between the start level of coke carbon gasification and the horizon below which iron oxides are directly reduced. It was shown, that the upper and lower thermal zones have fundamental differences in heat exchange conditions and are interconnected through the index of iron direct reduction degree. The transient processes of silicon variation in the hot metal studied at variation of iron ore load, natural gas flow rate, temperature and humidity of the hot blast, oxygen content in the hot blast and slag basicity. It was shown that the oscillatory transition process is observed in case, after applying the perturbation, it will have the opposite effect on the thermal conditions of the lower and the upper stages of heat exchange in the blast furnace. The iron ore load, hot blast humidity and slag basicity were found to be the most predictable input parameters affecting the concentration of silicon in hot metal. Change in oxygen concentration in hot blast and natural gas consumption have an alternating character of influence on thermal conditions of the blast-furnace hearth. At that, the characteristics of the transient processes of blast furnaces through various channels of action vary and depend significantly on the properties of the smelted raw materials, design and operational parameters of the furnaces
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Urióstegui-Hernández, Antonio, Pedro Garnica-González, José Ángel Ramos-Banderas, Constantin Alberto Hernández-Bocanegra, and Gildardo Solorio-Díaz. "Multiphasic Study of Fluid-Dynamics and the Thermal Behavior of a Steel Ladle during Bottom Gas Injection Using the Eulerian Model." Metals 11, no. 7 (July 6, 2021): 1082. http://dx.doi.org/10.3390/met11071082.
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In this work, the fluid dynamic and thermal behavior of steel was analyzed during argon gas stirring in a 140-t refining ladle. The Eulerian multiphase mathematical model was used in conjunction with the discrete ordinates (DO) thermal radiation model in a steel-slag-argon system. The model was validated by particle image velocimetry (PIV) and the analysis of the opening of the oil layer in a physical scale model. The effect of Al2O3 and Mg-C as a refractory in the walls was studied, and the Ranz-Marshall and Tomiyama models were compared to determine the heat exchange coefficient. The results indicated that there were no significant differences between these heat exchange models; likewise, the radiation heat transfer model adequately simulated the thermal behavior according to plant measurements, finding a thermal homogenization time of the steel of 2.5 min for a gas flow of 0.45 Nm3·min−1. Finally, both types of refractory kept the temperature of the steel within the ranges recommended in the plant; however, the use of Al2O3 had better heat retention, which would favor refining operations.
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Makarov, A. N. "HEAT EXCHANGE IN HIGH POWER ARC STEEL FURNACES Part III. INTERCONNECTION OF HEAT EXCHANGE, HEIGHT OF SLAG LAYER, EFFICIENCY OF ARCS AND SPECIFIC ELECTRICITY CONSUMPTION." Metallurg, no. 11 (2022): 41–46. http://dx.doi.org/10.52351/00260827_2022_11_41.
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Shubov, L. Ya, I. G. Doronkina, O. N. Borisova, L. M. Tyger, and T. R. Lyubetskaya. "Analytical evaluation and systematization of technologies for extraction of rare metals from production waste." E3S Web of Conferences 311 (2021): 09005. http://dx.doi.org/10.1051/e3sconf/202131109005.
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The article is a message containing systematized information on resource-saving technologies as the basic for involving metal-containing secondary raw materials in the economic turnover. The set of independent technologies arranged in a certain sequence that solve the problems of resource saving allows us to compare the specific features and effectiveness of the use of each of them, the details and features of the processes. It is shown that the following can be the main sources of rare metals and REE: phosphogypsum (REE, Sr); ash and slag waste from TPPs, ash and slag waste (REE, Ti, Sc); metallurgical slags (Ge, Be, Se, Te, V); sulfuric acid dust (Se, Te); alumina production waste - red mud (Sc, REE); liquid waste from sulphate production of titanium dioxide (Sc, Ti); refinery dust bins (Se, Te); wastes from production of permanent magnets (Nd, Sm). It is noted that the technology uses beneficiation methods, acid leaching and ion-exchange concentration, biotechnology, electrolysis, heat treatment, a combination of different methods. To assess the quality of man-made raw materials and their suitability for complex processing and utilization, the article uses the methodology of analytical research of a set of patented technological solutions (technological samples were taken from real man-made deposits).
Dissertations / Theses on the topic "Slag heat exchange"
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Nguyen, Clayton Ma. "Heat transfer coefficients of particulate in tubular heat exchangers." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53960.
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This experimental study explores the heat transfer from heated bare and finned tubular surfaces to particulates in packed bed cross flow. The results from this experiment will be used to help select the type of particulates that will be used. Additionally, these results will assist in estimating heat transfer in prototype and commercial particle to fluid heat exchangers (PFHX).
This research is part of larger effort in the use of particulates in concentrating solar power technology. These solid particles are heated by concentrated sunlight to very high temperatures at which they are a suitable heat source for various thermal power and thermochemical cycles. Furthermore, one of the advantages of this concept is the ability to store thermal energy in the solid particles at relatively low cost. However, an important feature of any Particle Heat Receiver (PHR) system is the PFHX, which is the interface between the solar energy system and the thermal power or chemical system. In order to create this system material data is needed for the design and optimization of this PFHX.
The paper focuses on the heat transfer properties of particulates to solid surfaces under plug flow conditions. The particulates will be evaluated for three grain sizes of sand and two grain sizes of proppants. These two materials will be tested at one, five and ten millimeters per second in order to see how the various flow rates, which will be required for different loads, will affect the heat transfer coefficient. Finally the heat transfer coefficient will also be evaluated for both finned and non-finned heat exchangers to see the effect that changes in the surface geometry and surface area have on the heat transfer coefficient. The heat transfer coefficient will help determine the appropriate material that will be used in the PHR system.
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Pilík, Václav. "Bydlení pro seniory." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-410076.
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The diploma thesis is elaboration of project documentation of the object Housing for seniors in Brno - Dolní Heršpice. The site is located un the area with the planned development of the city. The object is detached, three-story with a partial basement. The building is divided into five parts. The building is based on concrete foundation pads and strips. The structural construction is a combined column and wall system in technological design as monolithic concrete. The building is designed as a low energy building, with contact insulation (ETICS). The whole building is designed with forced air exchange. An extensive and intensive walkable flat roof is designed. The aim is to create small, barrier-free, community housing with affordable services and support, with a possible life expectancy. Services for the elderly with reduced self-sufficiency and with mild health and mental dysfunctions are considered. The building is equipped with space for accommodation with a capacity of 48 beds, space for eating with a separate kitchen, space for leisure and physical activities, space for basic health and social care and space for administrative and technical facilities. The construction is divided into several buildings, the subject of the thesis is primarily the solution SO.01 - Housing for seniors
Book chapters on the topic "Slag heat exchange"
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Dolado, Pablo, Ana Lzaro, Jos Mara, and Beln Zalb. "PCM-Air Heat Exchangers: Slab Geometry." In Heat Exchangers - Basics Design Applications. InTech, 2012. http://dx.doi.org/10.5772/32920.
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Ramesh Korasikha, Naga, Thopudurthi Karthikeya Sharma, Gadale Amba Prasad Rao, and Kotha Madhu Murthy. "Recent Advancements in Thermal Performance Enhancement in Microchannel Heatsinks for Electronic Cooling Application." In Heat Transfer - Design, Experimentation and Applications [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97087.
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Thermal management of electronic equipment is the primary concern in the electronic industry. Miniaturization and high power density of modern electronic components in the energy systems and electronic devices with high power density demanded compact heat exchangers with large heat dissipating capacity. Microchannel heat sinks (MCHS) are the most suitable heat exchanging devices for electronic cooling applications with high compactness. The heat transfer enhancement of the microchannel heat sinks (MCHS) is the most focused research area. Huge research has been done on the thermal and hydraulic performance enhancement of the microchannel heat sinks. This chapter’s focus is on advanced heat transfer enhancement methods used in the recent studies for the MCHS. The present chapter gives information about the performance enhancement MCHS with geometry modifications, Jet impingement, Phase changing materials (PCM), Nanofluids as a working fluid, Flow boiling, slug flow, and magneto-hydrodynamics (MHD).
Conference papers on the topic "Slag heat exchange"
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Dasgupta, Sarbadaman, Faisal A. Siddiqui, Md Abdul Quaiyum, Serena A. Al-Obaidi, and Amir Fartaj. "Experimental Study on Air Cooling via a Multiport Mesochannel Cross-Flow Heat Exchanger." In ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2011. http://dx.doi.org/10.1115/icnmm2011-58257.
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Researchers are moving forward to provide energy efficient, compact and inexpensive heat exchangers. Main focus is being deployed to the heat exchangers comprising narrow size flow channels such as mesochannels and microchannels for their augmented heat transfer characteristics, compactness and energy efficiency compared to conventional heat exchangers with the same heat exchange duty. Air to water cross-flow heat exchangers are encountered in many engineering applications. While numerous investigations were performed to characterize the heat transfer and fluid flow in mesochannels and microchannels, the literatures examining the air side heat transfer and flow behaviors in the cross-flow mesochannel heat exchangers are inadequate. In the current study air side heat transfer and flow characteristics of cross-flow cooling of air through a multiport slab mesochannel heat exchanger were investigated experimentally. The major components of experimental setup are the closed loop integrated thermal wind tunnel, liquid circulation network with heat add or removal system arrangement, sets of measuring instruments, data acquisition system, and multiport slab mesochannel heat exchanger as the test specimen. The multiport slab mesochannel heat exchanger consists of 15 finned aluminum slabs with 304 mm × 304 mm size frontal area and 100 mm flow length across the direction of air flow. Each slab contains 68 flow channels of 1mm circular diameter. Cold deionized (DI) water at a constant mass flow rate (0.0196 kg/s) was forced to flow through the mesochannels whereas the hot air at different velocities was allowed to pass through the finned passages of the heat exchanger core in cross-flow orientation. The inlet air temperature was changed in three levels (28°C, 33°C and 38°C) while maintaining a constant inlet water temperature of 8° C. The air velocity was varied in four steps (3.5m/s, 5.5m/s, 7.5m/s, and 9.5 m/s) at each temperature level. In the present study heat transfer and fluid flow key parameters such as heat transfer rate (Q˙), number of transfer units (NTU), effectiveness (ε), overall thermal resistance (Rtotal), and the air side Nusselt number (Nua) as well as Reynolds number (Rea) were examined in the region of the air side Reynolds number at the range of 972–2758, with a constant water side Reynolds number of 135. Heat balance performance of the experiment was found to be 4% for all operating conditions. The air side thermal resistance was found to be dominating over the overall thermal resistance ranging from 85% to 91% of the overall thermal resistance. The effect of air side Reynolds number on air side Nusselt number was examined and a general correlation of Nusselt number with Reynolds number was obtained as Nua = 0.3972(Rea)0.3766. The Nusselt number value was found to be higher in comparison with other research works for the corresponding Reynolds number range. The multiport mesochannel flat slab has offered uniform temperature distribution into the core. This uniform temperature distribution leads to higher heat transfer over standalone inline flow tube bank.
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Khan, Mesbah G., and Amir Fartaj. "Heat Transfer Experiments of Ethylene Glycol-Water Mixture in Multi-Port Serpentine Meso-Channel Heat Exchanger Slab." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-31131.
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In past few years, narrow diameter flow passages (≤3 mm) have attracted huge research attentions due to their several advantageous features over conventional tubes (≥6 mm) especially from the view points of higher heat transfer, lesser weight, and smaller device size. Several classifications of narrow channels, based on sizes, are proposed in the open literature from mini to meso and micro (3 mm to 100 μm). The meso- and micro-channels have not yet entered into the HVAC and automotive heat exchanger industries to the expected potentials to take the above-mentioned advantages. The reasons may be the limited availability of experimental data on pressure drop and heat transfer and the lack of consolidated design correlations as compared to what is established for compact heat exchangers. While a number of studies available on standalone single straight channels, works on multi-channel slab similar to those used as typical thermal heat exchanger core elements are inadequate, especially the research on multichannel serpentine slab are limited in the open literature. The 50% ethylene glycol and water mixture is widely used in heat exchanger industry as a heat transfer fluid. Studies of pressure drop and heat transfer on this commercially important fluid using narrow tube multi-channel slab is scarce and the availability of experimental data is rare in the open literature. Conducting research on various shapes of meso- and micro-channel heat exchanger cores using a variety working fluids are a definite needs as recommended and consistently urged in ongoing research publications in this promising area. Under present long-term project, an automated dynamic single-phase experimental infrastructure has been developed to carryout the fluid flow and heat transfer research in meso- and micro-channel test specimens and prototype microchannel heat exchanger using a variety of working fluids in air-to-liquid crossflow orientation. In the series, experiments have been conducted on 50% ethylene glycol and water solution in a serpentine meso-channel slab having 68 individual channels of 1 mm hydraulic diameter to obtain the heat transfer data and the general pressure drop nature of the test fluid. Current paper presents the heat transfer characteristics of ethylene glycol-water mixture and the Reynolds number effects on pressure drop, heat transfer rate, test specimen NTU and effectiveness, overall thermal resistance, and the Nusselt number.
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Dukhan, Nihad, and Kuan-Chin Chen. "Analysis of Constant-Heat-Flux Heat Transfer in Metal Foam." In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33051.
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The use of open-cell metal foam in contemporary heat exchange technologies is increasing rapidly. The high surface area density of metal foam places them among the best options for heat exchanger core materials. Certain simplifying assumptions for the combined conduction/convection heat transfer analysis in metal foam have not been exploited. Solving the complete, and coupled, fluid flow and heat transfer governing equations numerically is time consuming. A simplified two-dimensional analytical model for the heat transfer in open-cell metal foam block subjected to constant heat flux, and cooled by a low-conductivity fluid, is presented. The model assumes local thermal equilibrium between the solid and fluid phases in the foam, and neglects the conduction in the fluid. The local thermal equilibrium assumption is supported by previous studies performed by other workers. The velocity profile in the foam is taken as non-Darcean slug flow. An approximate solution for the temperature profile in the foam is obtained analytically. The temperature profile decays in what looks like an exponential fashion as the distance from the heat base increases, and increases in the flow direction. The model along with the simplifying assumptions were verified by direct experiment using air and an aluminum foam block heated from above by constant heat flux, for a range of Reynolds numbers. Very good agreement was found between the analytical and the experimental results.
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Andersson, Victor, Bengt Sunde´n, and Martin Holm. "Simulation of Two-Phase Flow in a Heat Exchanger Distributor Application." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60587.
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In this work, computations of the air/water flow in a distributor were completed with the FLUENT two-phase VOF model and compared to experiments. The parameters of interest concerned the ratio between the deflected mass flow rate of the water phase to the mass flow rate of the water phase at the inlet called the deflection ratio as well as the recreation of the flow pattern of the different two-phase flows which involved slug, slug/annular and annular flows. Due to the time-consuming calculations, only 9 out of 27 experimental tests were simulated. In conclusion, it can be stated that it is possible, given the right conditions, to perform comparatively accurate simulations concerning two-phase flows in pipe applications with the FLUENT two-phase VOF model.
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Grabenstein, Volker, and Stephan Kabelac. "Experimental Investigations and Modelling of Condensation in Plate Heat Exchangers." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22385.
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The use of Plate Heat Exchanger (PHE) as condensers and evaporators increases every year. The easy and modular construction and the high thermal performance at very compact size make the PHE to an ideal heat exchanger for a wide range of applications. Due to the missing of authoritative models for the design of PHEs used as condensers or as evaporators they will typically be constructed larger than needed. For a physically based model more detailed knowledge is needed to take into account the flow and heat interactions during the condensation or evaporation process inside a PHE. In this work the two-phase flow in a PHE is analysed. For this purpose one gap of a PHE was built with two transparent polyurethane plates with the same geometrical parameter than the stainless steel plates of a commercial used PHE. Demineralized-water and air are used to define an exact 2-phase-flow. Measurements of the contact angles and surface energies of the stainless steel plates and the transparent polyurethane plates with different working fluids have been made to show the relation between the wettability and the surface energies of the plates. These measurements show a significant influence of the surface energies on the wettability of the steel and polyurethane plates and therefore it is necassary to take into account the plate material properties for the visualization experiments. A flow pattern map is developed and the typical flow patterns are presented and explained. The defined flow regimes converge with comparable data from the literature. The flow pattern of bubbly flow, irregular bubbly flow, film flow and slug flow can be identified. The film flow occurs over the whole range of the air flow rate and at superficial liquid velocities below 0.1 m/s. Above this limit at low flow rates of the gaseous phase a bubbly flow occurs and with increasing air flow rate the flow pattern changes at a superficial air velocity of 1.5 m/s to an irregular bubbly flow. With further rising of the gas phase fraction the irregular bubbly flow shifts at gas velocities nearly 4 m/s into a transition regime, which is marked by the mixed behaviour of the irregular bubbly and the slug flow regime. Slug flow can be identified when the superficial velocity of the air rises up to 7 m/s.
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Ismail, Mohammed, Shahram Fotowat, and Amir Fartaj. "Uniformity of Flow and Heat Transfer Distribution in Minichannel Heat Exchanger Slab: A Numerical Approach." In Modelling and Simulation. Calgary,AB,Canada: ACTAPRESS, 2013. http://dx.doi.org/10.2316/p.2013.802-073.
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Lee, Dong Eun, Jung Hyun Jang, and Man Young Kim. "A Numerical Study on the Slab Heating Characteristics in a Reheating Furnace With the Formation and Growth of Scale on the Slab Surface." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88186.
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In this work, the development of a mathematical heat transfer model for a walking-beam type reheating furnace is described and preliminary model predictions are presented. The model can predict the heat flux distribution within the furnace and the temperature distribution in the slab throughout the reheating furnace process by considering the heat exchange between the slab and its surroundings, including the radiant heat transfer among the slabs, the skids, the hot combustion gases and the furnace wall as well as the gas convection heat transfer in the furnace. In addition, present model is designed to be able to predict the formation and growth of the scale layer on the slab in order to investigate its effect on the slab heating. A comparison is made between the predictions of the present model and the data from an in situ measurement in the furnace, and a reasonable agreement is found. The results of the present simulation show that the effect of the scale layer on the slab heating is considerable.
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Vieira, Ronald E., Thiana A. Sedrez, Siamack A. Shirazi, and Gabriel Silva. "Multiphase Flow in Circular and Triangular Pipes: Examining Flow Characteristics, Sand Erosion and Heat Transfer Via CFD and Experimental Work." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/208101-ms.
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Abstract Air-water two-phase flow in circular pipes has been studied by many investigators. However, investigations of multiphase flow in non-circular pipes are still very rare. Triangular pipes have found a number of applications, such as multiphase flow conditioning, erosion mitigation in elbows, compact heat exchanges, solar heat collectors, and electronic cooling systems. This work presents a survey of air-water and air-water-sand flow through circular and triangular pipes. The main objective of this investigation is to study the potential effects of triangular pipe geometry on flow patterns, slug frequency, sand erosion in elbows, and heat transfer in multiphase flow. Firstly, twenty-three experiments were performed for horizontal air-water flow. Detailed videos and slug frequency measurements were collected through circular and triangular clear pipes to identify flow patterns and create a database for these pipe configurations. The effect of corners of the triangular pipe on the liquid distribution was investigated using two different orientations of triangular pipe: apex upward and downward and results of triangular pipes were compared to round tubes. Secondly, ultrasonic wall thickness erosion measurements, paint removal studies, and CFD simulations were carried out to investigate the erosion patterns and magnitudes for liquid-sand and liquid-gas-sand flows in circular and triangular elbows with the same radius of curvature and cross-sectional area. Thirdly, heat transfer rates for liquid flows were also simulated for both circular and triangular pipe cross-sections. Although similar flow patterns are observed in circular and triangular pipe configurations, the orientation of the triangular pipes seems to have an effect on the liquid distribution and slug frequency. For higher liquid rates, slug frequencies are consistently lower in the triangular pipe as compared to the circular pipe. Similarly, the triangular elbow offers better flow behavior as compared to circular elbows when investigated numerically with similar flow rates for erosion patterns for both liquid-sand flow and liquid-gas-sand flows. Experimental and CFD results show that erosion in the circular elbow is about three times larger than in the triangular elbow. Paint studies results validated erosion patterns and their relations with particle impacts. Finally, heat transfer to/from triangular pipes is shown to be more efficient than in circular pipes, making them attractive for compact heat exchangers and heat collectors. This paper represents a novel experimental work and CFD simulations to examine the effects of pipe geometries on multiphase flow in pipes with several practical applications. The present results will help to determine the efficiency of utilizing triangular pipes as compared to circular pipes for several important applications and field operations such as reducing slug frequencies of multiphase flow in pipes, and reducing solid particle erosion of elbows, and also increasing the efficiency of heat exchangers.
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Hoysall, Dhruv C., Khoudor Keniar, and Srinivas Garimella. "Visualization of Two-Phase Flow Through Microchannel Heat Exchangers." In ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/icnmm2015-48821.
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Multiphase flow phenomena in single micro- and minichannels have been widely studied. Characteristics of two-phase flow through a large array of microchannels are investigated here. An air-water mixture is used to represent the two phases flowing through a microchannel array representative of those employed in practical applications. Flow distribution of the air and water flow across 52 parallel microchannels of 0.3 mm hydraulic diameter is visually investigated using high speed photography. Two microchannel configurations are studied and compared, with mixing features incorporated into the second configuration. Slug and annular flow regimes are observed in the channels. Void fractions and interfacial areas are calculated for each channel from these observations. The flow distribution is tracked at various lengths along the microchannel array sheets. Statistical distributions of void fraction and interfacial area along the microchannel array are measured. The design with mixing features yields improved flow distribution. Void fraction and interfacial area change along the length of the second configuration, indicating a change in fluid distribution among the channels. The void fraction and interfacial area results are used to predict the performance of different microchannel array configurations for heat and mass transfer applications. Results from this study can help inform the design of compact thermal-fluid energy systems.
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Takeuchi, Genki, Akiko Fujiwara, Yutaka Abe, and Yutaka Suzuki. "Study on Condensation Behavior in Two-Phase Flow Through a Microchannel." In ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52201.
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It is requested to develop a small and high performance heat exchanger for small size energy equipments such as fuel cells and CO2 heat pumps, et.al... In author’s previous studies, a high pressure resistant microchannel layers stacked heat exchanger has been developed. The heat exchanger is manufactured by diffusion bond technique. It can be used under high pressure condition larger than 15 MPa. Due to the high pressure resistance, the device can be applied for high flow rate condition with boiling and condensation. The objectives of the present study are to estimate the heat transfer performance of the heat exchanger and to investigate the thermal hydraulic behavior in the microchannel. The flow pattern in a glass capillary tube is observed by fabricating visualization system. As the results, it is measured that the present device attained high heat transfer quantity of approximately 7000 W on steam condensation despite the weight is only 230 g. The measurement results clarified that the device achieves very high heat transfer rate of hundreds times larger than that of the existing heat exchanger. Furthermore, visualization experiment with single glass pipe is conducted to clarify the flow condensation behavior in the microchannel. In the experiment, the microchannel of Pyrex glass is surrounded by the subcooling water. The flow patterns can visualized from the side of the microchannel. Flow patterns observations are conducted for various inlet pressure and temperatures of the subcooling water. It is observed that the continuous flow transition from annular and injection flow to slug-bubble flow in the microchannel. The reason of large heat transfer rate per unit volume is discussed as relating to narrow interval of each microchannels and small thermal resistance.
Reports on the topic "Slag heat exchange"
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Mittereder, N., and A. Poerschke. Ground Source Heat Pump Sub-Slab Heat Exchange Loop Performance in a Cold Climate. Office of Scientific and Technical Information (OSTI), November 2013. http://dx.doi.org/10.2172/1111203.
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Mittereder, Nick, and Andrew Poerschke. Ground Source Heat Pump Sub-Slab Heat Exchange Loop Performance in a Cold Climate. Office of Scientific and Technical Information (OSTI), November 2013. http://dx.doi.org/10.2172/1220905.
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Casademunt, Jaume. Injection of Nucleate-Boiling Slug Flows into a Heat Exchange Chamber in Microgravity. Fort Belvoir, VA: Defense Technical Information Center, June 2015. http://dx.doi.org/10.21236/ada626943.
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