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Journal articles on the topic 'Centrifugal heater'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Пинягин, Дмитрий Сергеевич, Наталия Михайловна Труфанова та Никита Александрович Костарев. "Исследование процессов тепломассопереноса в нефтяной скважине с~призабойным нагревателем различной длины". Computational Continuum Mechanics 17, № 2 (2024): 143–50. http://dx.doi.org/10.7242/1999-6691/2024.17.2.13.

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This paper considers a three-dimensional mathematical model of heat and mass transfer in an oil well with a bottom-hole heater. The vertical section of an oil well with an electric bottom-hole heater device for wells with highly viscous and paraffinic oil was investigated. The bottomhole heater is a monolithic cylinder located in the lower part of the tubing. The tubing contains perforations through which the oil fluid enters the tubing. The use of a local heater in the near-wellbore area makes it possible to increase the temperature of the fluid flowing through it, thereby reducing the viscos

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Kammuang-Lue, Niti, Deuansavanh Phommavongsa, Kritsada On-Ai, Phrut Sakulchangsatjatai, and Pradit Terdtoon. "Thermal Resistance of a Rotating Closed-Loop Pulsating Heat Pipe: Effect of Centrifugal Accelerations." Applied Mechanics and Materials 851 (August 2016): 292–98. http://dx.doi.org/10.4028/www.scientific.net/amm.851.292.

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Objective of this study is to experimentally investigate the effect of centrifugal accelerations on thermal resistance of the rotating closed-loop pulsating heat pipe (RCLPHP). The RCLPHPs were made of a copper tube with internal diameter of 1.50 and 1.78 mm and bent into flower’s petal-shape and arranged into a circle with 11 turns. The evaporator section located at the outer end of the bundle while the condenser section placed around the center of the RCLPHP with no adiabatic section. Both sections had an identical length of 50 mm. R123, and ethanol was filled as working fluid respectively.

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3

Sailani, Sunaina. "TO STUDY AND ANALYSIS OF FLAT PLATE SOLAR WATER HEATER PV CELLS." International Journal of Engineering Technologies and Management Research 5, no. 3 (2020): 159–65. http://dx.doi.org/10.29121/ijetmr.v5.i3.2018.188.

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In this study we are obtaining the maximum temperature of solar water heater using of PV cells. The flat plate solar water heater are consisting using several parts such as collector , flat plate glass , circulating pump, PV cells , frame . The centrifugal pump is operated by PV Cells. Water temperature is measured by digital temperature meter. Hot water is storage in container. The most elements of these are a clear front cover, collector housing associated an absorbent material.

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Sunaina, Sailani. "TO STUDY AND ANALYSIS OF FLAT PLATE SOLAR WATER HEATER PV CELLS." International Journal of Engineering Technologies and Management Research 5, no. 3 (2018): 159–65. https://doi.org/10.5281/zenodo.1216875.

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<strong><em>In this study we are obtaining the maximum temperature of solar water heater using of PV cells. The flat plate solar water heater are consisting using several parts such as collector , flat plate glass , circulating pump, PV cells , frame . The centrifugal pump is operated by PV Cells. Water temperature is measured by digital temperature meter. Hot water is storage in container. The most elements of these are a clear front cover, collector housing associated an absorbent material</em>.</strong>

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5

Worapong Boonchouytan, Nantapong Pongpiriyadecha, and Nutjired Kheowsakul. "Development and Improvement of a Vacuum Fryer and a Centrifugal Deoiling Machine for Deep-Fried Split-Gill Mushroom Production." Advances in Technology Innovation 10, no. 2 (2025): 132–42. https://doi.org/10.46604/aiti.2024.13935.

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This study aims to develop a vacuum fryer and a centrifugal deoiling machine for producing deep-fried split-gill mushrooms. The vacuum fryer prototype includes a fryer, oil heater, vacuum pump, and control system, while the deoiling machine features a steel frame, external barrel, centrifugal barrel, and transmission unit. Tests are conducted by frying split-gill mushrooms at 60, 80, and 100 ℃ for 5, 10, and 15 minutes. The deoiling machine removes oil at three rotational speeds (100, 300, and 500 rpm) and deoiling times (1, 3, and 5 minutes). Results show that the ideal frying condition is 80

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Sailani, Sunaina. "TO STUDY AND ANALYSIS OF SOLAR WATER HEATER USING VARIOUS MASS FLOW RATE." International Journal of Engineering Technologies and Management Research 5, no. 3 (2020): 139–44. http://dx.doi.org/10.29121/ijetmr.v5.i3.2018.185.

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Solar water heater is a device which is used for heating the water using of sun energy. This system is connected like as storage tank, centrifugal pump, pipes and glass. The circulating flexible water pipes are connected with the metallic pipe, which are assembled with the body. The solar radiation are achieving from sun and passing although glass and collector for the purpose of the heating the circulating water. In this way we are achieving the various temperatures using of circulating pump.

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7

Sunaina, Sailani. "TO STUDY AND ANALYSIS OF SOLAR WATER HEATER USING VARIOUS MASS FLOW RATE." International Journal of Engineering Technologies and Management Research 5, no. 3 (2018): 139–44. https://doi.org/10.5281/zenodo.1216839.

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<strong><em>Solar water heater is a device which is used for heating the water using of sun energy. This system is connected like as storage tank, centrifugal pump, pipes and glass. The circulating flexible water pipes are connected with the metallic pipe, which are assembled with the body. The solar radiation are achieving from sun and passing although glass and collector for the purpose of the heating the circulating water. In this way we are achieving the various temperatures using of circulating pump</em>.</strong>

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8

Putro, Sartono. "Application of The Rotary Dryer Machine in The Semi Modern Herbal Herbs Business Group in Nguter District, Sukoharjo Regency." Urecol Journal. Part E: Engineering 1, no. 2 (2021): 64–72. http://dx.doi.org/10.53017/uje.83.

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The purpose of this community service program is to apply the rotary dryer unit to the production of herbal herbs that do not require solar heat. Target on the management aspect, partners are able to manage business with standard business management. Partners have an entrepreneurial spirit and have a strong spirit. Activities are carried out with coordination and discussion with partners. A meeting to determine the capacity of the rotary dryer unit and the needs of electrical energy and heat sources. Whereas for the herbal medicine business entrepreneur group, coordination was carried out to d

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9

Hur, Deog-Jae, Seong-Il Song, and Hyun-Ju Lee. "Energy Consumption Characteristics for Design Parameters of Permanent Magnet-Based Al Billet Heater." Applied Sciences 12, no. 6 (2022): 3052. http://dx.doi.org/10.3390/app12063052.

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This study analyzed design factors to maximize energy efficiency, via numerical analysis, through an examination of the characteristics of a heating system that uses permanent magnets and is employed for preheating in the aluminum cladding extrusion process. The design parameters of the billet heater using permanent magnets are the magnetic flux direction, the number of magnets, clearance, and eccentricity. The magnetic flux density, current density, power loss, temperature, and energy consumption characteristics were examined using the results of the parameter variations. Numerical analysis f

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10

Harada, Yasunori, Yuji Miura, and Katsuhiko Takahashi. "Formation of Fe-Al Intermetallic Compound Film on Carbon Steel by Shot Peening and Heat Treatment." Advanced Materials Research 409 (November 2011): 802–7. http://dx.doi.org/10.4028/www.scientific.net/amr.409.802.

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The formation of an Fe-Al intermetallic compound film on carbon steel by shot lining and heat treatment was investigated. In the experiment, a centrifugal-type peening machine with an electrical heater was employed. The shot medium was high-carbon cast steel. The substrate was a commercial carbon steel, and the sheet was commercially available pure aluminum. The shot lining process of carbon steel with an aluminum sheet was carried out at 300 °C in air using a peening machine. Heat treatment was performed at diffusion temperatures from 600 to 1050 °C in vacuum. The lined substrates exhibited a

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Kannan, Nithiyananthan, N. Vasantha Gowri, T. Muralikrishna, et al. "Experimental Investigation on Incorporation of Zinc-Ferrite Nanocoated Baffles for Improving the Performance of Field Power Electrical Transformer Integrated with a Solar Air Heater." Advances in Materials Science and Engineering 2023 (April 17, 2023): 1–10. http://dx.doi.org/10.1155/2023/5657609.

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Solar energy is the most accessible, eco-friendly, and renewable energy source available to meet the world’s expanding energy needs. Solar collectors are commonly utilized to convert solar energy directly into heat for purposes ranging from house heating to timber seasoning and crop drying. The purpose of this research is to design a modified solar air heater (SAH) with a baffle plate and to examine the performance due to the provision of zinc-ferrite nanocoated baffles. The entire system is mounted over a transformer for effective cooling and also produces hot air for industrial requirements.

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Vimalachandran, T. Aurthur, Andrey Yurievich Tkachenko, and Viktor Nikolaevich Rybakov. "Parametric Performance of Ultra-light Gas Turbine Power Plant for Heavy Lift Multicopters Flight Systems Using Astra - Russian Aviation Engine Optimization Software." MATEC Web of Conferences 220 (2018): 03011. http://dx.doi.org/10.1051/matecconf/201822003011.

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A detailed parametric analysis was performed on entire performance cycle model of micro gas turbine power plant. The parametric analysis was studied using Russian Software named ASTRA. Evaluation of parameters on both design and operation condition was performed. The parameters focused here are power output, compression work, specific fuel consumption and thermal efficiency. Various stages such as use of Intercooler, Pre-heater and their optimal influence on thermodynamics were performed. The task was to optimize the maximum output in free turbine power by simulating various cycles of compress

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Sahni, Manoj, Parth Dinesh Mehta, Ritu Sahni, Ernesto León-Castro, and Luis F. Espinoza-Audelo. "Secondary Creep Analysis of FG Rotating Cylinder with Exponential, Linear and Quadratic Volume Reinforcement." Materials 15, no. 5 (2022): 1803. http://dx.doi.org/10.3390/ma15051803.

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Creep is an irreversible time-dependent deformation in which a material under constant mechanical stress and elevated temperature for a considerably prolonged period of time, starts to undergo permanent deformation. Creep deformation occurs in three stages namely, primary, secondary and tertiary. Out of these three stages, secondary or steady state creep is particularly an area of engineering interest as it has almost a constant creep rate. Creep deformation plays a significant role in understanding effective service life of an engineering component working under high temperature conditions as

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14

Chen, Changzhong, and Qiang Jia. "Study on engineering process and equipment operation of total treatment project of leachate and concentrated solution." Journal of Physics: Conference Series 2206, no. 1 (2022): 012023. http://dx.doi.org/10.1088/1742-6596/2206/1/012023.

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Abstract The accumulation of a large amount of leachate and concentrated liquid caused by MSW is a serious potential safety hazard and environmental hazard. A full treatment project of leachate and concentrate were performed, with treatment capacity of leachate 1100 t/d and concentrate 550 t/d. The leachate treatment process adopts “pretreatment + second-stage A/O biochemistry + ultrafiltration + chemical softening + second-stage DTRO+HPRO+RO+ ion exchange”. The main processing equipment is jet aerator, submersible mixer, centrifugal pump, ultrafiltration membrane assembly, softening membrane

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Brindisi, Nicholas, Alfred Stammers, Cody Trowbridge, Myra Klayman, James Pezzuto, and Molly Marko. "Use of a Multi-modality Life Support System." Journal of ExtraCorporeal Technology 40, no. 4 (2008): 268–70. http://dx.doi.org/10.1051/ject/200840268.

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The purpose of this study was to describe the design and utilization of a multi-modality life support system (MMLSS), which is used to provide extracorporeal support for cases such as left heart bypass (LHB), extracorporeal life support (ECLS), veno-venous bypass, and hypothermic resuscitation. The design of the MMLSS consisted of a mobile cart outfitted with a centrifugal pump, heater cooler, an in-line blood gas monitor, oxygen blender/flow meter, and assorted safety devices (pressure sensors and level and bubble detectors). A single disposable circuit was used for all procedures and designe

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Kutovy, V., and O. Kutsan. "Technological aspects of the development of thermal vacuum installation for drying grain with simultaneous dehydration and disinsection." Tehnologìâ virobnictva ì pererobki produktìv tvarinnictva, no. 2 (182) (November 23, 2023): 137–44. http://dx.doi.org/10.33245/2310-9289-2023-182-2-137-144.

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The Ukraine is one of the largest producers of grain products. Its natural and climatic conditions are such that annually from 50 to 80 % of the harvested crop of grain crops is subject to drying and disinfection. Drying and simultaneous disinsection of grain are the main technological operations for removing harmful moisture from grain material and freeing it from barn pests, which on a national scale makes it possible to avoid millions of losses. The article provides materials on the development of a highly efficient environmentally friendly installation and energy-saving technology of dehyd

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17

Getz, David, and Jose Palacios. "Design procedures and experimental verification of an electro-thermal deicing system for wind turbines." Wind Energy Science 6, no. 5 (2021): 1291–309. http://dx.doi.org/10.5194/wes-6-1291-2021.

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Abstract. There has been a substantial growth in the wind energy power capacity worldwide, and icing difficulties have been encountered in cold climate locations. Rotor blade icing has been recognized as an issue, and solutions to mitigate accretion effects have been identified. Wind turbines are adapting helicopter rotor and propeller ice protection approaches to reduce aerodynamic performance degradation related to ice formation. Electro-thermal heating is one of the main technologies used to protect rotors from ice accretion, and it is one of the main technologies being considered to protec

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18

Harada, Yasunori, Makoto Ishida, and Katsuhiko Takahashi. "Formation of Fe-Al Intermetallic Compound Film on High-Speed Tool Steel by Shot Lining and Heat Treatment." Materials Science Forum 783-786 (May 2014): 1414–19. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.1414.

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Shot peening is widely utilized to improve the fatigue property of mechanical parts for transportation equipment such as cars and airplanes. Also, this technology is being applied as a film-forming technology in order to improve surface quality. The authors have recently proposed new joining methods using shot peening, shot lining. In this method, the metals are bonded with the dissimilar metal by applying plastic deformation and the pressure. The thin foil can be joined to the substrate surface by the pressure generated by the hit of the shots. In this study, the formation of an Fe-Al interme

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Stammers, Alfred H., James D. Murdock, Myra H. Klayman, et al. "Utilization of rapid-infuser devices for massive blood loss." Perfusion 20, no. 2 (2005): 65–69. http://dx.doi.org/10.1191/0267659105pf787oa.

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Rapid volume replacement for severe hemorrhage continues to challenge the clinician involved in the care of the patient suffering hemorrhagic shock. We report on the development and utilization of two rapid-infuser systems for volume replacement in critically ill patients presenting in extremis. We have developed rapid-infusion circuits by using commercially available devices available at our institution. The primary pumping mechanism is either a centrifugal pump (Revolution™COBE Cardiovascular, Arvada, CO, USA), or the Myocar-dial Protection System (MPS™ - Quest Medical, Allen, TX, USA), and

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Yulianto, Rudy, Su Kardi, Faqih Udin, Meika Syahbana Rusli, and Dianta Mustofa K. "MESIN PENGERING GABAH MODEL BAK MENGGUNAKAN BAHAN BAKAR LPG." Jurnal Poli-Teknologi 21, no. 3 (2022): 124–28. http://dx.doi.org/10.32722/pt.v21i3.5081.

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Conventional drying relies on sunlight has a number of drawbacks. In terms of productivity, drying takes a long time, for example: two until three days for sunny day or four to five days for cloudy weather. Design of a combined gas-fueled rice drying machine (Liquefied Petroleum Gas) as an alternative in drying rice does not depend on weather conditions, in both rainy and dry season. This drying machine uses a hot air distribute in pipe that have functions to remove water evaporation from the dried materials. The circulation of hot air in the room is very important to produce drainage in the d

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Gupta, Murlidhar, Andrew McFarlan, Leslie Nguyen, and Fernando Preto. "Design and development of a novel centrifuge ablative pyrolysis approach for biomass conversion to bio-oil and bio-char." E3S Web of Conferences 61 (2018): 00016. http://dx.doi.org/10.1051/e3sconf/20186100016.

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Pyrolysis has evolved as a key pre-treatment step to produce renewable fuels and chemicals from agricultural and forestry residues. In the past few years, there have been different directions in the development of pyrolysis reactors. For example, in vortex and cyclone approaches, biomass particles are suspended in a flow of high supersonic velocities to ensure enough centrifugal forces for pressing the particles against the heated reactor surface. Although simple in design, the requirement of large volumes of carrier gases necessitates cumbersome downstream gas separation, resulting in thermod

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Knight, Earl W. "Recent Advances in Mechanical Dewatering of Digested Sludge." Water Science and Technology 21, no. 10-11 (1989): 1441–46. http://dx.doi.org/10.2166/wst.1989.0340.

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The present sludge processing operations at the District consist of heated anaerobic digestion, dewatering by centrifugation, and air drying. A critical unit operation in the overall sludge processing train is the mechanical dewatering step. Typically, sludge dewatering by the District's existing centrifuges produces a cake having a solids content of 15%. Four different types of mechanical sludge dewatering machines were evaluated in a pilot test program to determine if these machines could produce cakes having greater solids contents than that produced from the existing centrifuges. The machi

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23

Klyagin, G. S., А. B. Biryukov, and V. A. Sidorov. "History of blast furnace blowers." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 79, no. 5 (2023): 415–30. http://dx.doi.org/10.32339/0135-5910-2023-5-415-430.

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The development of blowers is inextricably linked with the stages of the history of technology and blast furnace production. The amount of blast is one of the main parameters of cast iron production, determining the size and performance of the blast furnace. Consideration of the issues of changing the design and drive of blowers starts from the natural draft and wedged leather bellows. The use of a horse-drawn drive or a water co-scaffold made it possible to increase the amount of air supplied to the furnace. The important event in the development of blowers was the advent of a steam engine, w

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KUHLMANN, H. C., and U. SCHOISSWOHL. "Flow instabilities in thermocapillary-buoyant liquid pools." Journal of Fluid Mechanics 644 (February 10, 2010): 509–35. http://dx.doi.org/10.1017/s0022112009992953.

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The linear stability of the incompressible axisymmetric flow in a buoyant-thermocapillary liquid pool is considered which is heated from above by a heat flux with a parabolic radial profile. Buoyancy forces and radial thermocapillary stresses due to the inhomogeneous surface temperature distribution drive a toroidal vortex. In the absence of buoyancy and for low Prandtl numbers the basic flow becomes unstable typically by a stationary centrifugal instability. At moderate Prandtl numbers the rotational symmetry is broken by hydrothermal waves. In the limit of vanishing Prandtl number two other

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Oikonomakos, Ioannis P., Niels O. Maness, Donna Chrz, William McGlynn, and Penelope Perkins-Veazie. "(43) Maturity Influences Lycopene Segregation during Filtration Processing of Red-fleshed Watermelons." HortScience 40, no. 4 (2005): 1030A—1030. http://dx.doi.org/10.21273/hortsci.40.4.1030a.

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Lycopene from ground watermelon flesh can be segregated between filtrate and filter cake by coarse filtration. Low speed centrifugation of the filtrate can further segregate filtrate lycopene between an easily recoverable precipitated high lycopene pellet and a serum. Lycopene in watermelon flesh increases steadily during maturation and remains constant, or slightly decreases in overripe melons. This study was conducted to document the effect of melon maturity on lycopene segregation during filtration/centrifugal processing. Flesh of three seedless watermelon cultivars was ground and filtered

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Miloradovic, Zorana N., Nemanja V. Kljajevic, Snezana T. Jovanovic, Tanja R. Vucic, and Ognjen D. Macej. "The effect of heat treatment and skimming on precipitate formation in caprine and bovine milks." Journal of Dairy Research 82, no. 1 (2014): 22–28. http://dx.doi.org/10.1017/s0022029914000636.

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Caprine and bovine milks have a similar overall gross composition, but vary considerably in the ratios of their casein components. These differences in colloidal casein micelles could affect directly or indirectly the heat stability of caprine and bovine milks at their natural pH. In the present work, the differences in colloidal stability of caprine and bovine milk have been studied by analysing the effect of heat treatment and skimming on precipitation of proteins. Raw and heated milk samples (70 °C/5 min, 80°C/5 min and 90°C/5 min) were centrifuged at 600, 2000, and 4500 g. The amount of pr

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27

Ghaaowd, Ismaail, John McCartney, and Fernando Saboya. "Centrifuge modeling of temperature effects on the pullout capacity of torpedo piles in soft clay." Soils and Rocks 45, no. 1 (2022): 1–13. http://dx.doi.org/10.28927/sr.2022.000822.

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This study presents the results from centrifuge modeling experiments performed to understand the effects of temperature changes on the vertical pullout capacity of scale-model torpedo piles embedded in soft clay layers. The model torpedo pile is a pointed stainless-steel cylinder with fins at the top, installed by self-weight to the base of a clay layer using a stepper motor. An internal electrical resistance heater was used to control the pile temperature. The torpedo pile was first heated until the temperature and pore water pressure of the surrounding clay layer stabilized (drained conditio

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Osmanov, Zaza, and Swadesh Mahajan. "On the Heating of AGN Magnetospheres." Universe 7, no. 4 (2021): 83. http://dx.doi.org/10.3390/universe7040083.

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The Langmuir–Landau-Centrifugal Drive (LLCD), which can effectively “convert” gravitational energy into particles, is explored as a driving mechanism responsible for the extreme thermal luminosity acquired by some active galactic nuclei (AGN). For this purpose, we consider equations governing the process of heating of AGN magnetospheres. In particular, we examine the Fourier components of the momentum equation, the continuity equation and the Poisson equation in the linear approximation and estimate the growth rate of the centrifugally excited electrostatic waves and the increment of the Langm

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Bostwick, J. B. "Spreading and bistability of droplets on differentially heated substrates." Journal of Fluid Mechanics 725 (May 17, 2013): 566–87. http://dx.doi.org/10.1017/jfm.2013.196.

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AbstractAn axisymmetric drop spreads on a radially heated, partially wetting solid substrate in a rotating geometry. The lubrication approximation is applied to the field equations for this thin viscous drop to yield an evolution equation that captures the dependence of viscosity, surface tension, gravity, centrifugal forces and thermocapillarity. We study the quasi-static spreading regime, whereby droplet motion is controlled by a constitutive law that relates the contact angle to the contact-line speed. Non-uniform heating of the substrate can generate both vertical and radial temperature gr

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Stott, Jillian A. K., and James P. Denier. "The stability of boundary layers on curved heated plates." ANZIAM Journal 43, no. 3 (2002): 333–58. http://dx.doi.org/10.1017/s1446181100012554.

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AbstractWe consider the effect the competing mechanisms of buoyancy-driven acceleration (arising from heating a surface) and streamline curvature (due to curvature of a surface) have on the stability of boundary-layer flows. We confine our attention to vortex type instabilities (commonly referred to as Görtler vortices) which have been identified as one of the dominant mechanisms of instability in both centrifugally and buoyancy driven boundary layers. The particular model we consider consists of the boundary-layer flow over a heated (or cooled) curved rigid body. In the absence of buoyancy fo

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Steshin, A. S., and A. V. Babkin. "Design Technique for Calculating Functional Parameters of a Rotating Shaped Charge with Preliminary Heated Liner." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 1 (88) (February 2020): 61–70. http://dx.doi.org/10.18698/1812-3368-2020-1-61-70.

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The paper considers a separate issue of the shaped charge functioning, i.e., functioning of a rotating charge under preliminary thermal action on its liner. Estimates of two oppositely directed factors are provided: 1) increase in the shaped-charge jet dynamic plasticity (limit elongation coefficient); 2) increase in the jet susceptibility to centrifugal destruction. These factors are activated by preliminary thermal action on the shaped charge liner in the jet heated in excess of usual parameters. The so-called "thermal" increase in the limit elongation coefficient was estimated using empiric

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Auer, M., F. H. Busse, and R. M. Clever. "Three-dimensional convection driven by centrifugal buoyancy." Journal of Fluid Mechanics 301 (October 25, 1995): 371–82. http://dx.doi.org/10.1017/s0022112095003934.

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Convection driven by centrifugal buoyancy in a cylindrical fluid annulus cooled from the inside, heated from the outside, and rotating about its axis is described. While at high values of the dimensionless rotation parameter τ convection rolls aligned with the axis are preferred, three-dimensional patterns of convection are introduced at low values of τ through either the cross-roll instability or a subharmonic varicose instability. The instabilities are studied in terms of simple analytical relationships as well as through numerical methods based on the Galerkin scheme. Analytical expressions

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Lopez, Jose M., Francisco Marques, and Marc Avila. "The Boussinesq approximation in rapidly rotating flows." Journal of Fluid Mechanics 737 (November 15, 2013): 56–77. http://dx.doi.org/10.1017/jfm.2013.558.

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AbstractIn commonly used formulations of the Boussinesq approximation centrifugal buoyancy effects related to differential rotation, as well as strong vortices in the flow, are neglected. However, these may play an important role in rapidly rotating flows, such as in astrophysical and geophysical applications, and also in turbulent convection. Here we provide a straightforward approach resulting in a Boussinesq-type approximation that consistently accounts for centrifugal effects. Its application to the accretion-disc problem is discussed. We numerically compare the new approach to the typical

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Hwang, G. J., and C. R. Kuo. "Experimental Studies and Correlations of Convective Heat Transfer in a Radially Rotating Serpentine Passage." Journal of Heat Transfer 119, no. 3 (1997): 460–66. http://dx.doi.org/10.1115/1.2824119.

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The present paper investigates experimentally the effects of rotation on the convective heat transfer of air flow in a radially rotating three-passage serpentine square channel. Due to rotation, the cross-stream and radial secondary flows are induced by the Coriolis force and the centrifugal-buoyancy force, respectively. The channel walls were made of low thermal conductivity material for suppressing wall heat conduction. The wall surfaces were heated individually by four separate stainless-steel film heaters to distinguish the local heat transfer rates. The hydraulic diameter and the mean rot

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RAYER, Q. G. "A NUMERICAL INVESTIGATION OF THE FLOW IN A FULLY BLOCKED DIFFERENTIALLY HEATED ROTATING FLUID ANNULUS." International Journal of Modern Physics C 05, no. 02 (1994): 203–6. http://dx.doi.org/10.1142/s0129183194000155.

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A computational model has been used to determine the terms in the dynamical equations which are responsible for the formation of a certain horizontal circulation seen in a simply connected, differentially heated rotating fluid annulus. Experiments with a differentially heated rotating fluid annulus that is fully blocked by a thin, rigid, vertical radial barrier at rotation rates of up to 5 rad.sec−1 and with an externally applied radial temperature difference of 4 or 10 °C show two principal circulations. This paper is concerned with the mechanism for one of those circulations, which occurs in

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Amin, Arslan Ahmed, Muhammad Taimoor Maqsood, and Khalid Mahmood-ul-Hasan. "Surge protection of centrifugal compressors using advanced anti-surge control system." Measurement and Control 54, no. 5-6 (2021): 967–82. http://dx.doi.org/10.1177/0020294020983372.

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Centrifugal Compressors (CCs) are widely used equipment to transport the natural gas over long-distance pipelines from the gas processing facility to end consumers. Surge protection is of vital importance for such compressors to avoid costly damage to machine and production loss due to process interruption. In this paper, the dynamic behaviour of CCs has been studied during four critical scenarios: high header pressure, low suction pressure, startup of the new unit, and emergency shutdown of the unit. The dynamic simulation has been carried out using HYSYS software and validated with an indust

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Karwiński, A., W. Lesniewski, P. Wieliczko, and M. Małysza. "Casting of Titanium Alloys in Centrifugal Induction Furnaces." Archives of Metallurgy and Materials 59, no. 1 (2014): 403–6. http://dx.doi.org/10.2478/amm-2014-0068.

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Abstract This paper discusses technical problems related with casting of titanium alloys in centrifugal vacuum furnaces. The potentials of an analysis of the centrifugal casting process carried out in the Flow3D software CFD (Computational Fluid Dynamics) were presented. Simulations were carried out on a model set, which enables casting of two connecting rods for an I.C. engine. Changes in the mould filling process were examined for the three selected spinning velocities of the casting arm. The ranges of the metal flow velocity in mould were calculated as well as metal pressure in mould after

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Brummell, N., J. E. Hart, and J. M. Lopez. "On the Flow Induced by Centrifugal Buoyancy in a Differentially-Heated Rotating Cylinder." Theoretical and Computational Fluid Dynamics 14, no. 1 (2000): 39–54. http://dx.doi.org/10.1007/s001620050124.

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Saleh, H., and I. Hashim. "Numerical Analysis of Nanofluids in Differentially Heated Enclosure Undergoing Orthogonal Rotation." Advances in Mathematical Physics 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/874132.

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Natural convection heat transfer in a rotating, differentially heated enclosure is studied numerically in this paper. The rotating enclosure is filled with water-Ag, water-Cu, water-Al2O3, or water-TiO2nanofluids. The governing equations are in velocity, pressure, and temperature formulation and solved using the staggered grid arrangement together with MAC method. The governing parameters considered are the solid volume fraction,0.0 ≤ ϕ ≤ 0.05, and the rotational speeds,3.5≤ Ω ≤ 17.5 rpm, and the centrifugal force is smaller than the Coriolis force and both forces were kept below the buoyancy

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Lo Schiavo, A. "Keratoacanthoma centrifugum marginatum treated and healed by etretinate." Journal of the European Academy of Dermatology and Venereology 5, no. 1 (1995): S129. http://dx.doi.org/10.1016/0926-9959(95)96285-g.

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Cheng, K. C., and F. P. Yuen. "Flow Visualization Experiments on Secondary Flow Patterns in an Isothermally Heated Curved Pipe." Journal of Heat Transfer 109, no. 1 (1987): 55–61. http://dx.doi.org/10.1115/1.3248067.

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Secondary flow patterns at the exit of a 180 deg bend (tube inside diameter d = 1.99 cm, radius of curvature Rc = 10.85 cm) are presented to illustrate the combined effects of centrifugal and buoyancy forces in hydrodynamically and thermally developing entrance region of an isothermally heated curved pipe with both parabolic and turbulent entrance velocity profiles. Three cases of upward, horizontal, and downward-curved pipe flows are studied for constant wall temperatures Tw=55–91°C, Dean number range K=22–1209 and ReRa=1.00×106–8.86×107. The flow visualization was realized by the smoke injec

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Abdel Wahid, Taha Zakaraia. "Exact analytical solution of the influence of an external centrifugal field and the heat transfer on a confined gas between two plates in the unsteady state." Advances in Mechanical Engineering 12, no. 11 (2020): 168781402097588. http://dx.doi.org/10.1177/1687814020975880.

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This paper aims to study the non-stationary situation of the effectiveness of an external centrifugal force (ECF) and the heat transfer (HT) on the manner of neutral gas (NG). We solve a system of non-linear non-stationary partial differential equations, which represents an enormous task. Our model is examined to follow the manner of the macroscopic properties of the NG that bounded between two parallel horizontal rigid fixed plane plates (HRFPPs). The moment method and the traveling wave method are utilized. The draw an analogy among the perturbed distribution function (DF), and the equilibri

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Cheng, K. C., and F. P. Yuen. "Flow Visualization Studies on Secondary Flow Patterns in Straight Tubes Downstream of a 180 deg Bend and in Isothermally Heated Horizontal Tubes." Journal of Heat Transfer 109, no. 1 (1987): 49–54. http://dx.doi.org/10.1115/1.3248066.

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Photographs are presented for secondary flow patterns in a straight tube (x/d = 0 ∼ 70) downstream of a 180 deg bend (tube inside diameter d = 2.54 cm, radius of curvature Rc = 12.7 cm) and in an isothermally heated horizontal tube (tube inside diameter d = 2.54 cm, heated length l = 46.2 cm) with free convection effects. Each test section is preceded by a long entrance length with air as the flowing fluid. For curved pipes, the Dean number range is K = 99 to 384. At the exit of the 180 deg bend, the onset of centrifugal instability in the form of an additional pair of Dean vortices near the c

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Mei, Shunqi, Teng Liu, Long Chen, and Yifan Wang. "Preparation and Performance of a PU/PAN Lithium-Ion Battery Separator Based on a Centrifugal Spinning Method." Applied Sciences 13, no. 11 (2023): 6682. http://dx.doi.org/10.3390/app13116682.

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The diaphragm is a key component of the lithium-ion battery and largely determines its performance. Currently, commercial diaphragms suffer from poor thermal stability, low porosity, and low liquid absorption rate. In this study, we prepared a polyurethane/polyacrylonitrile (PU/PAN) lithium-ion battery diaphragm using a centrifugal spinning method with PU as the main substrate and PAN as the additive. The results showed that the PU/PAN nanofiber diaphragm prepared by centrifugal spinning had a 3D porous structure, and when using 18% PU:PAN = 7:3, the porosity of the fiber diaphragm was 83.9%,

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Kaletnіk, Grygorii, Vitalii Yaropud, and Yurii Polevoda. "NUMERICAL SIMULATION OF THE DRYING PROCESS BY ACTIVE VENTILATION OF THE PRODUCTS OF FRACTIONAL PROCESSING OF LEGUMES IN A CONVECTIVE BELT DRYER." ENGINEERING, ENERGY, TRANSPORT AIC, no. 2(121) (August 25, 2023): 5–15. http://dx.doi.org/10.37128/2520-6168-2023-2-1.

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The process of removing moisture from vegetable agricultural raw materials is a diverse, but energy-consuming stage of production, regardless of the applied methods and methods of drying. For forecasting energy consumption and designing drying equipment, analysis and generalization of the kinetics and dynamics of drying of plant raw materials is an urgent task. Based on the results of the conducted research, the technological and constructive-technological scheme of the convective belt dryer for the fractional processing of leguminous herbs was theoretically justified. The dryer is made in the

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Bad’in, Yu A. "Study of Reasons for Damage of Steel 45Kh25N20S Centrifugally-Cast Tubes in Reaction-Heater Furnaces." Chemical and Petroleum Engineering 54, no. 7-8 (2018): 472–81. http://dx.doi.org/10.1007/s10556-018-0504-1.

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Kedia, R., M. L. Hunt, and T. Colonius. "Numerical Simulations of Heat Transfer in Taylor-Couette Flow." Journal of Heat Transfer 120, no. 1 (1998): 65–71. http://dx.doi.org/10.1115/1.2830066.

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Numerical simulations have been performed to study the effects of the gravitational and the centrifugal potentials on the stability of heated, incompressible Taylor-Couette flow. The flow is confined between two differentially heated, concentric cylinders, and the inner cylinder is allowed to rotate. The Navier-Stokes equations and the coupled energy equation are solved using a spectral method. To validate the code, comparisons are made with existing linear stability analysis and with experiments. The code is used to calculate the local and average heat transfer coefficients for a fixed Reynol

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Torii, Shuichi, and Wen-Jei Yang. "Thermal-Fluid Transport Phenomena of a Strongly-Heated Gas Flow in Parallel Tube Rotation." International Journal of Rotating Machinery 4, no. 4 (1998): 271–82. http://dx.doi.org/10.1155/s1023621x98000232.

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A numerical analysis is performed to study thermal transport phenomena in gas flow through a strongly heated tube whose axis is in parallel with the rotational axis. The velocity and temperature fields prevail when fluid flows in a rotating tube with uniform heat flux on the tube wall. The two-equationk-ωturbulence andt2¯-εtheat transfer models are employed to determine turbulent viscosity and eddy diffusivity for heat, respectively. The governing boundary-layer equations are discritized by means of a control volume finitedifference techniques. It is found that the Coriolis and centrifugal (or

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Milosan, Ioan, Tibor Bedő, Camelia Gabor, et al. "Characterization of Aluminum Alloy–Silicon Carbide Functionally Graded Materials Developed by Centrifugal Casting Process." Applied Sciences 11, no. 4 (2021): 1625. http://dx.doi.org/10.3390/app11041625.

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The continuous development of modern industries rises the necessity for functionally graded materials. This research starts from the consideration that the incorporation of SiC particles in the molten aluminum alloy can be difficult due to the very low wettability of SiC particles. In order to increase their wettability, SiC particles were covered with a layer of metallic copper. The incorporation of SiC particles into the aluminum alloy mass was performed by centrifugal casting. The secondary hypoeutectic Al-Si alloy used in this study was elaborated within the crucible of a resistors heated

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Saleh, H., and I. Hashim. "Magnetohydrodynamic Natural Convection in a Rotating Enclosure." Advances in Applied Mathematics and Mechanics 8, no. 2 (2016): 279–92. http://dx.doi.org/10.4208/aamm.2013.m419.

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AbstractMagnetohydrodynamic natural convection heat transfer in a rotating, differentially heated enclosure is studied numerically in this article. The governing equations are in velocity, pressure and temperature formulation and solved using the staggered grid arrangement together with MAC method. The governing parameters considered are the Hartmann number, 0≤Ha≤70, the inclination angle of the magnetic field, 0°≤θ 90°, the Taylor number, 8.9 x 104≤Ta≤1.1 x 106 and the centrifugal force is smaller than the Coriolis force and the both forces were kept below the buoyancy force. It is found that

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