Relevant bibliographies by topics / Heat-exchanging surface

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Heat-exchanging surface'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Heat-exchanging surface"

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Shaukatovich Misbakhov, Rinat, Victor Mihaylovich Gureev, Nikolai Ivanovich Moskalenko, Andrey Mihaylovich Ermakov, and Ilyas Zul’fatovich Bagautdinov. "Simulation of Surface Intensification of Heat Exchange in Shell-and-Pipe and Heat Exchanging Devices." Biosciences, Biotechnology Research Asia 12, no. 2 (September 25, 2015): 517–25. http://dx.doi.org/10.13005/bbra/2228.

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Biryukov, A. B., and Ya S. Vlasov. "Analysis of modern trends in recuperative burners perfection." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 75, no. 8 (September 6, 2019): 971–78. http://dx.doi.org/10.32339/0135-5910-2019-8-971-978.

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At present, recuperative burners are becoming more extended in the gas-heated facilities, thanks to their significant advantages comparing with conventional gas-burning devices. However, the wide application of the recuperative burners is restricted by their high price. Therefore, studies for perfection recuperative burner designs and technologies of aggregates heating with the burners application are very actual. Results of analysis of modern ways of the burners designs and methods of their application presented, including diagnostics of the recuperative burner heat-exchanging surface state, optimization of the heat-exchanging surface and others. Items of ribbing rational parameters selection for imbedded recuperative devices considered. Perfection of the preliminary combustion chambers and air distribution by combustion stages are important ways of the recuperative burner perfection. It was noted, that in addition to traditional two-stage combustion systems, three-stage combustion systems are appeared lately. It was showed, that under unfavorable conditions of a furnace running, a significant contamination of the recuperative device surface can take place earlier comparing with the set regulation time of periodical cleaning, resulting in losses related to increase of fuel consumption. From the other side, unjustified decrease of the furnace operation period between the recuperative device surfaces cleaning is inconvenient in organization. A methodology of operative diagnostic of a recuperative device state elaborated, due to which the estimation of the imbedded recuperative device heat-exchanging surface state can be done by the identification of the current values of recuperation coefficient and their comparing with the standard values. The methodology enables regulating the periods of cleaning of the surfaces of both the central recuperative devices and recuperative burners.
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TATARKANOV, Aslan Adal bievich, Islam Alexandrovich ALEXANDROV, and Andrej Vladimirovich OLEJNIK. "EVALUATION OF THE CONTACT SURFACE PARAMETERS AT KNURLING FINNED HEAT-EXCHANGING SURFACE BY KNURLS AT RING BLANKS." Periódico Tchê Química 17, no. 36 (December 20, 2020): 372–89. http://dx.doi.org/10.52571/ptq.v17.n36.2020.387_periodico36_pgs_372_389.pdf.

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Tubular parts with an external finned heat-exchanging surface are usually produced by the laborious method of cutting on lathes. Besides, there is a method for the high-performance manufacturing of fins by cold knurling with ring-cut knurls, which, compared with cutting, reduces labor intensity by two to six times with a significant increase in the operational properties of the product. The disadvantage of the cold knurling method with ring-cut knurls can be unwanted surface defects and deformations of the entire product. Obtaining finned surfaces on ring blanks with high surface quality during knurling requires accurate calculation of the ratio of longitudinal and transverse strains. The most important factors determining the ratio of longitudinal and transverse strains (rolling-out and rolling-off) are the length and width of the contact surface. The need for a quantitative assessment of the parameters of longitudinal and transverse strains determined the purpose of this manuscript. This study aimed to develop a methodology for calculating the contact surface of a knurl with a ring blank (pipe) when knurling with ring-cut knurls. The proposed method for calculating the knurl's contact surface with a tube when knurling with ring-cut knurls allows for estimating the recommended range of pipe sizes for knurling. Based on the dependencies mentioned in the manuscript, the limiting sizes for blank pipes were calculated to ensure high-quality finning. Experiments on cold rolling of ribbing on pipes with different lengths and diameter ratios were carried out, confirming the possibility of using the proposed methodology for calculating the knurl's contact surface with a pipe when knurling heat-exchanging finning with ring-cut knurls.
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Sun, Yu, Yong Zheng Wang, Ke Zhang, and Yun Gang Li. "Effect of Additives on Ash Corrosion on Heat Exchanging Surface of Biomass Boilers." Key Engineering Materials 837 (April 2020): 95–101. http://dx.doi.org/10.4028/www.scientific.net/kem.837.95.

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This paper focuses on the problems of ash deposition and corrosion caused by alkali metal chloride in biomass boiler. Kaolin, pulverized coal ash, silica fume, dolomite, limestone and bauxite are used as additives in this study, to investigate the degree of corrosion of four metal materials on biomass boiler. The results show that the corrosion rate of metal samples is significantly reduced after adding additives. Kaolin, pulverized coal ash, silica fume and bauxite show much obvious effect on corrosion inhibition. Corrosion resistance of four pipe metals: T91>15CrMoG>12CrMoVG>20G, in which the corrosion resistance of T91 is much better than the other three metals.
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Agzamov, Shavkat, and Sevinar Nematova. "Features of creation and use of effective heat exchangers." E3S Web of Conferences 216 (2020): 01124. http://dx.doi.org/10.1051/e3sconf/202021601124.

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The article discusses the features of the creation and use of efficient heat exchanger. Designs of pipes with a developed heat exchange is presented. The procedure for determining the degree of development of the heat exchanging surface, the heat transfer coefficient, and the calculation of the heat transfer equation are given. As a result of creating efficient heat exchangers, three main parameters are used: the pipe outside diameter; the estimated flow rate; the Prandtl number.
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He, Bing Qiang, Chun Ling Liao, and Ji Yong Chen. "The Research on the Surface Temperature Field of the Gas Cooler in the Microchannel." Applied Mechanics and Materials 190-191 (July 2012): 1331–35. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.1331.

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Empirical studies on the heat exchange characteristic of the span borderline CO2 of the parallel flow gas cooler in the hol-aluminium microchannel and the surface temperature distribution of the gas cooler during heat exchanging of the span borderline CO2. Through experiments we got the surface temperature distribution of the cooler in the wind. These studies provide evidences for the design of the hol-aluminium mirochannel parallel flow gas cooler in the carbon dioxide automobile air conditioning system.
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Yao, Jing Hong. "A Kind of Energy Saving Method Based on Improving Turbine Condenser Vacuum." Advanced Materials Research 347-353 (October 2011): 3116–19. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.3116.

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Vacuum is an important economic indicator of influencing turbine load and thermal efficiency. And heat transfer efficiency affects the level of vacuum directly. From the point of heat transfer analysis, combining with the production practice in a power plant, this paper proposes a method of improving heat transfer effectiveness and the condenser exchanging condition. Through the method of reducing the heat load of condenser, improving the tightness of the vacuum system, cleaning the heat surface and reducing the cooling water temperature, we improve the vacuum and reach the aim of energy saving.
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Bi, Hai Yang, Yong Mao Shang, and Xiang Hong Gu. "Key Problem Analysis and Solution on Intake Water and Heat Transfer of Sewage-Source Heat Pump System." Advanced Materials Research 1070-1072 (December 2014): 1799–802. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1799.

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Changing "high consumption energy, low temperature heat to the indoor, waste heat to the environment", and turning the HVAC harmoniously into the natural ecological cycle, conform to the trend of the development of ecological architecture. Heat pump technology is a way of HVAC energy saving the most practical. Although low heat and cold source of the city sewage is ideal, but the quality is very unstable, can not meet the operation requirements of heat exchange equipment. This paper analyzes the key problems of the sewage side in sewage source heat pump technology application in the present: hair dirt clog sewage heat exchanger; fouling in heat surface reduces the heat transfer performance, and results in large heat-transfer equipment in the practical application. According to the key problems of sewage side, this paper prevents hair clogged with large tube heat exchanger; reduces the fouling thermal resistance, and enhances heat transfer process using the heat exchanging technology of circulating fluidized bed.
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Masutomi, Yuji, Keisuke Ono, Masayoshi Mano, Atsushi Maruyama, and Akira Miyata. "A land surface model combined with a crop growth model for paddy rice (MATCRO-Rice v. 1) – Part 1: Model description." Geoscientific Model Development 9, no. 11 (November 21, 2016): 4133–54. http://dx.doi.org/10.5194/gmd-9-4133-2016.

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Abstract. Crop growth and agricultural management can affect climate at various spatial and temporal scales through the exchange of heat, water, and gases between land and atmosphere. Therefore, simulation of fluxes for heat, water, and gases from agricultural land is important for climate simulations. A land surface model (LSM) combined with a crop growth model (CGM), called an LSM-CGM combined model, is a useful tool for simulating these fluxes from agricultural land. Therefore, we developed a new LSM-CGM combined model for paddy rice fields, the MATCRO-Rice model. The main objective of this paper is to present the full description of MATCRO-Rice. The most important feature of MATCRO-Rice is that it can consistently simulate latent and sensible heat fluxes, net carbon uptake by crop, and crop yield by exchanging variables between the LSM and CGM. This feature enables us to apply the model to a wide range of integrated issues.
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Kim, Chang Yeoul, Jong Kyu Lee, and Byung Ik Kim. "Characteristics of Silica Aerogel Composites Synthesized by Ambient Drying Method." Materials Science Forum 544-545 (May 2007): 673–76. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.673.

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Aerogel has its advantages of light density of 0.003-0.35 g/cm3 and its high specific surface area, 600-1000m2/g, mean pore diameter ~20nm. However, aerogel has its disadvantages of fragility and high cost. To overcome the mechanical fragility, we synthesized aerogel composite blankets with glass wools by drying at ambient atmosphere. Colloidal silica sol was first prepared by ion exchanging sodium silicate through amberlite column. Then, glass wool was soaked into the pH-controlled silica aerogel and then gelated. Ageing of silica aerogel composite was conducted in purified water and solvent exchange/surface modification was simultaneously processed in hexane and TMCS solution. After drying at 60oC and heat-treatment at 230oC, we evaluated the properties of aerogel composite, its apparent density and specific surface area.
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Dissertations / Theses on the topic "Heat-exchanging surface"

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Smolinský, Petr. "Dvoutlaký horizontální kotel na odpadní teplo (HRSG)." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232159.

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This master‘s thesis deals with the design of horizontal heat recovery steam generators (HRSG) with two pressure levels after a combustion turbine. In the introduction part is performed thermal calculation and proposal of a heat transfer surfaces. Furthermore, are suggested dimensions of the drums and pipes for flooding and transferring. The emphasis is placed on the fulfillment the required parameters of steam and flue gas at HRSG outlet. At the end is calculated loss of boiler draft and made technical documentation a drawing of the boiler.
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Loukota, Martin. "Návrh dvoutlakého vertikálního kotle na odpadní teplo za plynovou turbínou na zemní plyn." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319280.

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This master‘s thesis deals with design of vertical heat recovery steam generators (HRSG). In the introduction part is performed description and distribution HRSG, thermal calculation, proposal of a heat transfer surfaces and choice of materials. Finally is executed aerodynamic calculation, hydraulic calculation and then are suggested dimensions of the drums. Thesis also includes technical documentation of the boiler.
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Hradil, Lukáš. "Posouzení kotle na odpadní teplo." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228700.

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This theses work is concerned with assessment of transfer line exchanger behind pusher furnace. First part is describing technical characteristic and parametres. The most important part of this theses is thermic calculation of the boiler. Last following part is concerned with suggestions of constructional modifications of heating surface for proper functioning of boiler. These modifications are demonstrated by scheme in the enclosure.
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Book chapters on the topic "Heat-exchanging surface"

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Ismagilov, Z. R., O. Yu Podyacheva, V. V. Pushkarev, N. A. Koryabkina, V. N. Antsiferov, Yu V. Danchenko, O. P. Solonenko, and H. Veringa. "Development and study of metal foam heat-exchanging tubular reactor: Catalytic combustion of methane combined with methane steam reforming." In Studies in Surface Science and Catalysis, 2759–64. Elsevier, 2000. http://dx.doi.org/10.1016/s0167-2991(00)80888-5.

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Conference papers on the topic "Heat-exchanging surface"

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Shaw, Surupa, and Debjyoti Banerjee. "Exploring Augmentation of Thermal-Fluid Transport in Fractal Architectures." In ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-7492.

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Cost effective solutions involving thermal-fluid transport need to be developed for various energy applications. The miniaturization of the chip architecture in the electronic devices have caused the challenge of increased heat dissipation and higher power consumption. Hence there is an immediate need for developing efficient and cost-effective solutions for next generation cooling systems. This thermal management challenge can be addressed with maximizing the surface area of the heat exchanging surfaces that can allow dissipation of high heat fluxes. Fractal structures are known to maximize the surface area for compact volumes and are explored as a potential technique to addressing the issue of maximizing heat fluxes in compact volumes. Fractal structures are effective in maximizing the surface area in compact volumes. Fractals possess the property of self-similarity (the pattern is similar to itself at different levels of magnifications) and infinite recursion (created by repeating a simple process infinitely). Enhanced heat transfer in microelectronic devices can be achieved by increasing the available surface area for heat exchanging fluids within a compact volume. Fractal structures can provide the appropriate technology for the enhancement in heat transfer for these devices. The proposed model is used to predict the thermal-fluid flow characteristics in microchannel geometries with fractal hierarchies. The chosen fractal architectures in this study are observed to enhance the heat transfer due to the augmentation of surface area in the fractal branching networks of varying length-scales.
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Dai, Chunhui, Jun Wu, Sichao Tan, Zhenxing Zhao, Qi Xiao, Zhouyang Liu, and Yong Liu. "Research on Thermal Hydraulic Characteristics of Passive Containment Cooling System for Ship Nuclear Power Platform." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60173.

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Ship nuclear power platform is a small and movable power plant on the sea, aiming at generating electric energy and producing fresh water, it provides support for the national energy strategy. Subsequent to a loss of coolant accident (LOCA), steam is vented in the reactor containment following vaporization of liquid and/or steam expansion. The temperature as well as pressure in the condensation rises synchronously. For removing heat and reducing pressure inside containment subsequent to a LOCA, the Passive containment cooling system of Ship nuclear power platform is designed. In order to establish and maintain the passive heat removing channel, steam condenses on the containment condenser tube surface, coupling natural convection of the seawater inside the tubes. The heat transfer mechanism of Passive containment cooling system is very complex. To solve this problem, a three dimensional heat exchanging/one dimensional natural circulation coupling numerical computing method is proposed to obtained the safety performance of the reactor containment. Models of heat exchanging process between steam which contains non-condensable gas inside the reactor containment and sea water outside are firstly established. Then the thermal-hydraulic characteristics of the steam and sea water beside the heat transfer tubes are obtained by a simulation which is carried out in a LOCA.
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Pelevic´, Nikola R., and Theo H. van der Meer. "Numerical Modeling of New Heat Exchanger Materials." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22360.

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Heat transfer enhancement of carbon-nano fibers (CNF’s) attached on a wall surface within a micro-channel is investigated in this paper using a three-dimensional numerical method. Carbon-nanofibers, also known as graphite nanofibers, can be grown by catalytic decomposition of certain hydrocarbon at a metal surface such as iron, cobalt, nickel and some of their alloys. Typical sizes of CNF’s vary between 2 and 100 nm, with lengths ranging from 5 to 100 μm. Experimental research has shown that the presence of carbon-nano fibers grown on a surface of a fine metallic structure can enhance heat transfer by 50% [2]. These fibers influence the fluid flow, and enlarge the heat exchanging surface. The enhancement depends very much on the carbon-nano fibers density and on the structure of the carbon-nano fibers itself. This numerical study is giving directions in optimizing this new material. A random generation growth model has been developed to generate a stochastic structure of the CNF layer. Next to this a 3D Lattice Boltzmann model has been developed to simulate the heat transfer in a micro-channel flow with the surface covered with CNF’s. The 3D Lattice Boltzmann model has been verified on microchannel flow with heat transfer. Results of the conjugate heat transfer (including CNF’s at the wall) will be presented. The influence of carbon-nano fibers density and their structure on the heat transfer coefficient through the carbon-nano fibers layer is determined.
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Yu, Jiwon, Seok-won Kang, Saeil Jeon, and Debjyoti Banerjee. "Investigation of Convective Heat Transfer of Aqueous Nanofluids in Microchannels Integrated With Temperature Nanosensors." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64082.

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Forced convective heat transfer experiments were performed for internal flow of de-ionized water (DIW) and aqueous nanofluids (ANF) in microchannels that were integrated with a calorimeter apparatus and an array of temperature nanosensors. The heat flux and wall temperature distribution was measured for the different test fluids as a function of fluid inlet temperature, wall temperature, heat flux, nanoparticles concentration, nanoparticle materials (composition, nanoparticle size and shape) and flow rates. Anomalous behavior of the nanofluids in convective heat transfer was observed where the heat flux varied as a function of flow rate and bulk temperature. The heat exchanging surfaces were characterized using electron microscopy (SEM, TEM) to monitor the change in surface characteristics both before and after the experiments. Precipitation of nanoparticles on the walls of the microchannels can lead to the formation of “nano-fins” at low concentrations of the nanoparticles while more rampant precipitation at high concentration of the nanoparticles in the nanofluids can lead to scaling (fouling) of the microchannel surfaces leading to degradation of convective heat transfer — compared to that of pure water under the same experimental conditions. Also, competing effects resulting from the decrease in the specific heat capacity as well as anomalous enhancement in the thermal conductivity of aqueous nanofluids can lead to counter-intuitive behavior of these test liquids during forced convective heat transfer.
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Bao, Ainan, Dexin Wang, and Cheng-Xian Charlie Lin. "Nanoporous Membrane Tube Condensing Heat Transfer Enhancement Study." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63530.

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A Transport Membrane Condenser (TMC), made from nanoporous membrane tube bundles, was developed by Gas Technology Institute (GTI) to recover the water vapor and its significant amount of latent heat from boiler flue gases to improve boiler efficiency and save water. Water vapor condensing phenomenon inside membrane pores is different in two aspects from surface condensation when the membrane pore size is in the nanometer scale. First, based on the pore capillary condensation mechanism—Kelvin equation, pore condensation can occur when local gas stream relative humidity is well below 100%, so more water condensation is possible at the same surface temperature compared with surface condensation. Second, as membrane heat exchanging surface continues evacuating condensed water to the permeate side, no water will be accumulated on the condensing surface, which eliminates the additional heat transfer resistance caused by the condensed liquid film (or droplets) for a conventional impermeable condensing surface. Experiments have been carried out to study the phenomena for both a nanoporous membrane tube bundle and an impermeable stainless steel tube bundle with the same characteristic dimensions. Flue gas streams with a water vapor mass fraction 11.3%, temperature ranges from 65°C to 95°C were used for the experimental study, which covers the typical TMC waste heat recovery application parameter range. Results show the convection Nusselt number of the membrane tube bundle is 50 to 80% higher than that of the impermeable stainless steel tube counterpart at typical condensation heat transfer conditions. More parameter study was also done to study a wider range of parameters. The condensing heat transfer enhancement effect gives a good perspective for using nanoporous membrane surface to design high efficiency condensing heat exchangers to recover both water vapor and its substantial amount of latent heat from high moisture content low grade waste heat streams.
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Onishi, Hajime, Haruka Yonekura, Yukio Tada, and Akira Takimoto. "Heat Transfer Performance of Finless Flat Tube Heat Exchanger With Vortex Generator." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23232.

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As the longitudinal vortex is known to be effective in enhancing heat transfer, a three-dimensional unsteady numerical analysis has been made especially for the flow and thermal fields in a unit element of flat tube heat exchanger with vortex generator (VG) in so-called middle Reynolds number range. Both staggered and in-lined arrangements of the tubes with VG are considered and results obtained from the case with VG are compared with those without VG. The study was aimed at the influence of Reynolds number and some geometrical parameters on the heat transfer and the pressure drop. Moreover, as little research has been considered the interaction between transverse vortices and longitudinal vortices in the literatures, the effect is also investigated. It is found that the longitudinal vortex plays an important role in enhancing the local heat transfer by exchanging the fluid from the tube surface region to the fresh fluid of the main flow region and lasts over long distances. Moreover, the longitudinal vortices restrain unsteady transverse vortex shedding. As a result, heat transfer rate for the flat tube with VG case is larger compared to that without VG case. From the view point of pressure drop, increase in pressure drop for the case with VG is not so much larger due to the restraint of transverse vortex shedding. Finally, heat transfer performance becomes higher for the flat tube with VG case compared to that without VG case for the same pumping power.
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Kaçar, E. Nadir, and L. Berrin Erbay. "Numerical Characterization of a Jet Impingement Cooling System Using Coupled Heat Transfer Analysis." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43371.

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In this study jet impingement cooling method is investigated with coupled analysis. Total cooling rate is observed for the specific jet impingement configuration using both finite volume and finite element methods. The specific configuration contains single row of jets of separate four rowed impingement cooling system. This single row is placed at the suction side of vane near trailing edge. For the observation, finite volume analysis is carried out via Fluent program. CFD model, which uses constant hot wall (target surface) temperature, is validated using the test case available in the literature. Constant wall temperature is 1250 K and hot gas of system is at 1500 K with 800 kPa. Moreover, conditions of cooling air are 500 K and 400 kPa. All conditions are determined to simulate specifications of a vane of middle class engine. The coupled solution is performed to calculate realistic heat transfer coefficient (htc) values. It involves concurrent execution of finite element analysis and finite volume analysis for aero-thermal optimization. Iterations are carried out via exchanging heat transfer coefficient values for finite element analysis and metal temperature values for finite volume analysis. At the end of three iterations, 8.1% decrease of htc values is obtained and optimum metal temperature values for the specified cooling configuration are calculated.
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Yuki, Kazuhisa, Akira Matsui, Hidetoshi Hashizume, and Koichi Suzuki. "Proposal of a Micro/Mini Cooling Device Using Fins-Installed Porous Media for High Heat Flux Removal Exceeding 1000W/cm2." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18318.

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Heat transfer characteristics of micro-sized bronze particle-sintered porous heat sinks and copper minichannel-fins heat sinks are experimentally investigated in order to clarify the feasibility of a newly proposed micro/mini cooling device using fins-installed porous media. Regarding the porous heat sinks, fin effect toward more inside of the porous medium is promoted by sintering the porous heat sink on the heat transfer surface, which results in increasing the heat transfer performance up to 0.8MW/m2K at heat flux of 8.2MW/m2 though there still remains a large pressure loss issue. In addition, the results clarify that the heat exchanging area exists only in the vicinity of the heat transfer surface. As to the minichannel-fins heat sinks, the influence of the channel width and the fin thickness are evaluated in detail. As a result, the minichannel-fins heat sink having the narrower channel width (i.e. scale effect) and lower porosity (i.e. thicker fin thickness with larger heat capacity) achieves higher heat transfer performance up to 0.10MW/m2K at 8.3MW/m2. However, rapid increase of pressure loss, which is occasionally observed in a microchannel due to vapor bubbles choking the narrow channel, still remains as an issue under flow boiling conditions in the minichannel. Finally, heat transfer performance of the fin-installed porous heat sink is numerically predicted by the control volume method. The simulation confirms that the heat transfer coefficient at each wall superheat of 0 and 30 degrees has performance 2.5 times and 2.0 times higher than that of the normal fins, which indicates that this heat sink coupling the micro and mini channels has high potential as efficient cooling method under high heat flux conditions exceeding 10MW/m2.
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Kuang, G., M. M. Ohadi, and Y. Zhao. "Experimental Study on Gas Cooling Heat Transfer for Supercritical CO2 in Microchannels." In ASME 2004 2nd International Conference on Microchannels and Minichannels. ASMEDC, 2004. http://dx.doi.org/10.1115/icmm2004-2352.

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The conventional refrigerants have considerable ozone depleting effect (CFC/HCFC) and global warming impact (HFC). Carbon Dioxide (CO2) is being investigated as an alternative refrigerant for vapor compression systems. In addition to its environmental benefits, Carbon Dioxide offers certain attractive thermal characteristics such as small surface tension, small liquid viscosity and large refrigerant capacity. Furthermore, when used with micro channels CO2 heat exchangers provide additional advantage of high compaction, low weight/low volume, while yielding excellent thermal performance. The objective of the present work was to study the heat transfer and pressure drop characteristics of supercritical CO2 gas cooling process in microchannels. A 10 ports microchannels tube with ID of 0.79mm was tested for the pressure range of 8 to 10MPa and mass flux range of 300 to 1200 kg/m2 s. As expected, mass flux has a significant influence both on the supercritical heat transfer and pressure drop coefficients. Pseudo-critical temperature (temperature at which the specific heat has maximum value for the given pressure) is found to play an important role in the CO2 heat exchanging process as well. Conventional forced convection heat transfer correlations fail to accurately predict the heat transfer coefficients of supercritical CO2 with deviations as much as 50% from experimental data, especially near pseudo-critical temperature. As the gas cooling pressure increases, the pressure drop decreases, which is due to the lower viscosity & higher density. Employing average specific heat along the entire tube length, a semi-empirical correlation was developed to predict the supercritical gas cooling process of CO2 in microchannels, within an error of 20%.
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Dalili, Farnosh, and Mats Westermark. "Design of Tubular Humidifiers for Evaporative Gas Turbine Cycles." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-203.

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In the evaporative gas turbine (EvGT) cycle, also referred to as the humid air turbine (HAT) cycle, the compressed air is humidified with water to increase the mass flow through the expander, resulting in high power output and high exhaust heat recovery potential. This paper presents a design methodology for tubular humidifiers, in which pressurized air is led inside of smooth metallic tubes and is brought into contact with a falling water film. The heat required for humidification is mainly taken from exhaust gas from the gas turbine on the shell side and also by recirculating water through the intercooler and the aftercooler. The most important parameters for designing tubular humidifiers are: heat transfer coefficient on the flue gas side; and mass transfer coefficient for water vapor on the air side. Important design aspects include: proper wetting of the tubes; how to avoid flooding of the tubes; entrainment of water droplets into the air stream; and boiling in the water film. All calculations in this paper are based on an evaporative gas turbine cycle applied for combined heat and power generation with a partial-flow humidification circuit, where a fraction of the compressed air is humidified while a major part is by-passed directly to the recuperator. It is concluded that the required heat exchanging surface can be reduced if humidification is carried out for only a fraction of the air (20–30 percent). Finned tubes are recommended to enhance the heat transfer per unit tube length.
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