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Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Star heat"

1

Andersson, Nils. "Neutron star seismology." Proceedings of the International Astronomical Union 8, S291 (August 2012): 159. http://dx.doi.org/10.1017/s1743921312023472.

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AbstractI will provide an overview of recent improvements in our models for vibrating neutron stars, discussing the role of composition, heat, crust elasticity and superfluidity. I will explain how the results may impact on observations, in particular related to magnetar QPOs and future gravitational-wave searches.
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2

Noor H. Dhaher, Mohammed K. Khashan, and Nawfel Muhammed Baqer Muhsin. "One Dimensional Steady-State Heat Transfer on a Star Fin Shape." CFD Letters 14, no. 12 (November 18, 2022): 1–10. http://dx.doi.org/10.37934/cfdl.14.12.110.

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The convection heat transfers on a surface exposed to the fluid may be enhanced by attaching to the surface, known as the fins. To keep the system stable, heat transmission via solids, boundaries, or walls must be continuously dissipated to the environment or surroundings. A large quantity of heat must be dissipated from a small space in many engineering applications. A fin can boost the surface area’s effectiveness; hence, maximize convectional heat. Two shapes of straight aluminum fins have been used, cylindrical and star shape. The result shows that the star fins are appealing due to the same diameter and length; it has a lot more heat transfer than a cylindrical fin. In electronic devices, cylindrical and star fins are provided on the surface of the processor device. The result is done by SolidWorks simulation with 300 ºC on the surface as well as cylindrical and star fin. Input parameters like thermal conductivity, heat transfer coefficient, as well as fin’s density and dimensions are measured. The temperature distribution, heat flow, as well as heat flux all resembles output parameters.
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3

Bošnjaković, Mladen, Ante Čikić, Simon Muhič, and Mario Holik. "Heat Transfer Correlations for Star-Shaped Fins." Applied Sciences 11, no. 13 (June 25, 2021): 5912. http://dx.doi.org/10.3390/app11135912.

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Star-shaped fins are a newer type of fin for which correlations for heat transfer and pressure drop do not yet exist in the literature. Therefore, correlation equations for air-side heat transfer and pressure drop in a finned heat exchanger with star-shaped stainless-steel fins in staggered arrangement were developed in this work. To obtain these correlations, a numerical analysis of the basic heat exchanger geometry and another 21 variants of heat exchanger geometry was performed using computational fluid dynamics, and then the results of laboratory tests of a model of heat exchangers with star-shaped fins were used. In the numerical analysis, the fin pitch, the fin thickness, and the air velocity at the inlet to the heat exchanger were varied. The Nusselt (Nu) and Euler (Eu) numbers were determined for each variation analyzed. Initial correlations for Nu and Eu were derived using the least-squares deviation method. The correlation coefficients thus obtained were adjusted to agree with the results of the laboratory tests. The deviation of the final obtained correlation for Nu from the experimental test results was up to 10% in the range of Re < 3500, whereas for higher values of Re, the deviation was less than 2%. The Eu correlation deviated from experimental results up to 19% in the range of Re < 4000, whereas in the range of Re > 5600, the deviation was less than 1%. The correlations were valid in the range 2000 < Re < 16,000.
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4

Lazzari, G., and F. V. De Blasio. "Heat diffusion time in neutron star crusts." Astrophysics and Space Science 229, no. 2 (July 1995): 311–16. http://dx.doi.org/10.1007/bf00626872.

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5

Hui, C. Y., and K. S. Cheng. "Anisotropic Heat Transfer Inside Rotating Neutron Stars." Symposium - International Astronomical Union 218 (2004): 39–40. http://dx.doi.org/10.1017/s0074180900180520.

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We have developed the anisotropic heat transport equation for rotating neutron stars. With a simple model of neutron star, we also model the propagation of heat pulses resulting from transient energy releases inside the star. Even in the slow rotation limit, the results with rotational effects involved could differ significantly from those obtained with a spherically symmetric metric in the timescale of the thermal afterglow.
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6

GOVENDER, M., K. S. GOVINDER, S. D. MAHARAJ, R. SHARMA, S. MUKHERJEE, and T. K. DEY. "RADIATING SPHERICAL COLLAPSE WITH HEAT FLOW." International Journal of Modern Physics D 12, no. 04 (April 2003): 667–76. http://dx.doi.org/10.1142/s0218271803003086.

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We present here a simple model of radiative gravitational collapse with radial heat flux which describes qualitatively the stages close to the formation of a superdense cold star. Starting with a static general solution for a cold star, the model can generate solutions for the earlier evolutionary stages. The temporal evolution of the model is specified by solving the junction conditions appropriate for radiating gravitational collapse. The results will be useful in constructing models for the evolution of X-ray pulsars, like Her X-1.
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7

Yost, D. A., R. K. Burkhard, and R. C. Hoseney. "Heat-Burst Calorimetry of Heated Starch." Starch - Stärke 38, no. 11 (1986): 366–68. http://dx.doi.org/10.1002/star.19860381102.

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8

Dorokhov, A. S., А. G. Aksenov, A. V. Sibirev, M. A. Mosyakov, and N. V. Sazonov. "Study of an Exhaust Gas Heat Separation System for the Beet Harvester." Agricultural Machinery and Technologies 16, no. 1 (March 18, 2022): 19–26. http://dx.doi.org/10.22314/2073-7599-2022-16-1-19-26.

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Анотація:
It was noted that increased soil moisture worsens the quality of harvesting root crops due to a decrease in the completeness of separation. To increase the separating capacity of a slotted cleaner for root crops, it was proposed to improve the heating of the separating surface with hot exhaust gas. (Research purpose) To optimize the design and technological parameters of an exhaust gas heat separation system of the sugar beet harvester power plant. (Materials and methods) Federal Scientific Agroengineering Center VIM developed an exhaust gas heat separation system for harvesting root crops and potatoes in high moisture conditions using the heat of the harvester power plant exhaust gases. The cleaning quality of the separating system of a self-propelled sugar beet harvester was determined under the gradual engine load from 0 to 100 percent of the nominal rated power. The temperature of the exhaust gases was measured with the assumption of changes in the engine load and its effective power. (Results and discussion) The experiment revealed an increase in the completeness of the separation of a root crops heap from 96.0 to 98.8 percent at 26-32 percent soil moisture due to the separation system in the form of a cleaning star, which uses the heat of the engine exhaust gases. The established optimal values of the factors under consideration are as follows: the separating star rotation rate is 21.8 revolutions per minute, the distance between the separating star and the deflector is 128.4 millimeters. (Conclusions) It was determined that the high quality of the technological process of root crops harvesting in high soil moisture conditions ensuring a 97-percent separation efficiency is possible if optimize the separating device design and technological parameters and maintain the separating star rotation rate at 20-22 revolutions per minute and the distance between the separating star and the deflector within 120-140 millimeters. The authors noted the prospects of developing this system and the need for theoretical and experimental studies to improve the design and technological process of the harvester separating system.
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9

Urpin, V. "Neutron star oceans: Instability, mixing, and heat transport." Astronomy & Astrophysics 421, no. 1 (June 11, 2004): L5—L8. http://dx.doi.org/10.1051/0004-6361:20040165.

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10

Bošnjaković, M., A. Čikić, S. Muhič, and M. Stojkov. "Tube heat exchanger with new star shaped fins." IOP Conference Series: Materials Science and Engineering 393 (August 10, 2018): 012071. http://dx.doi.org/10.1088/1757-899x/393/1/012071.

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Дисертації з теми "Star heat"

1

Comstock, Robert. "Hypersonic Heat Transfer Load Analysis in STAR-CCM+." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2226.

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This thesis investigates the capabilities of STAR-CCM+, a Computational Fluid Dynamics (CFD) software owned by Siemens, in predicting hypersonic heat transfer loads on forward-facing surfaces. Results show that STAR-CCM+ predicted peak heat transfer loads within +/- 20% of experimental data on the leading edge of a delta wing design from the X-20 Dyna-Soar program with 73o of sweep. Steady-state laminar simulations were run as replications of wind tunnel tests documented in NASA CR-535, a NASA technical report that measured and studied the hypersonic pressure and heat transfer loads on preliminary X- 20 wing designs across a wide range of Reynolds numbers and Mach numbers in different wind tunnel and shock tunnel facilities. One of the Mach 8.08 test cases that was run at NASA Arnold Engineering Development Center Wind Tunnel B was selected as the case of comparison for this thesis, which was designated as test AD462M-1 in the original report. The CFD simulations assumed an ideal gas in laminar flow with temperature-dependent viscosity, thermal conductivity, and isobaric specific heat across an angle of attack range from 0o to 30o. A separate CFD study of heat transfer loads of a hemisphere-cylinder at Mach 6.74 was used as a simpler and less computationally-expensive validation case compared against wind tunnel data from NASA Langley Research Center to help select the appropriate CFD solver and mesh settings for this thesis. For the hemisphere-cylinder, the heat transfer load at the stagnation point was overpredicted in STAR-CCM+ by 21.8%. Peak heat transfer loads on the delta wing leading edge were all within +/- 20% of the wind tunnel data, which was published for angles of attack between 15o to 30o. A more adverse heat transfer gradient along the leading edge of the delta wing was also observed in the direction from the front of the wing to the outer wing tip when compared to wind tunnel data. The pressure loads on the delta wing leading edge in CFD were within +/-10% of wind tunnel measurements.
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2

Mannar, Kamantha. "Comparison of heat transfer models at the pebble, gas and reflector interface in the PBMR / Kamantha Mannar." Thesis, North-West University, 2010. http://hdl.handle.net/10394/5083.

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It is a great challenge in the design of the PBMR to accurately predict gas flow and heat transfer in the reactor. Understanding the heat transfer at the core-reflector interface in particular is a very important aspect as the reactivity of the control rods housed in the reflectors is highly temperature dependent. It is also very important because the core-reflector interface is on the critical path for heat removal during accident conditions. PBMR has developed an OECD/NEA coupled neutronic/thermal-hydraulic benchmark to aid in the understanding of the different modelling approaches currently employed at PBMR. A comparison of THERMIX-KONVEK and DIREKT results showed large temperature differences at the core-reflector interfaces. Further investigation showed that these differences are as a result of the numerical methods used i.e. Cell-Centred (CC) vs. Vertex-Centered (VC). The present study extended this comparison to Star-CD (CC) and Flownex (VC) which are also used to simulate the reactor at PBMR. An ID MATLAB program that mimics the CC and VC numerical methods was verified against Star-CD and Flownex. This program was then used to model an ID version of the OECD/NEA benchmark. Results were compared with DIREKT and THERMIX-KONVEK. Although the results compared well, there were significant errors at the core-reflector interfaces. The findings of this study were that different numerical methods will predict different temperatures, heat fluxes and (temperature-dependent) sink terms. It was also shown that in addition to the differences resulting from numerical methods, differences were seen between Star-CD and DIREKT and Flownex and THERMIX-KONVEK in the region of the core-reflector boundary. In general, for complicated simulations like that of the pebble bed, the numerical basis of software used to simulate the problem needs to be understood for the problem to be correctly modelled.
Thesis (M.Sc. Engineering Sciences (Nuclear Engineering))--North-West University, Potchefstroom Campus, 2010.
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3

Magdon, Jan. "Simulace odmrazování krycího skla světlometu a jeho aplikace v automobilovém průmyslu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442804.

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Práce se zabývá výzkumem v oblasti odmrazování světlometu. Jejím cílem je vytvoření numerického simulačního modelu, který dokáže předpovídat průběh odmrazování, zároveň tak může odhalit nedostatky při návrhu světlometu. Na simulační modelu jsou testovány proměnlivé parametry, výsledkem práce je nalezení optimálních podmínek, které zajistí validní výsledky simulace při současné úspoře výpočetního času.
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4

Hui, Chung-yue, and 許宗宇. "Anisotropic heat transfer inside rotating neutron stars." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B29275611.

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5

Osley, Kristin R. "A head start on reading for children in a Head Start preschool program." Thesis, University of North Texas, 2009. https://digital.library.unt.edu/ark:/67531/metadc10985/.

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Literacy is a fundamental to all areas of learning. Early reading experiences prior to elementary school and kindergarten years are critical factors for later reading success. This study evaluated the effect Direct Instruction® reading procedures vs. Scholastic Early Childhood Program® reading procedures on the production of letter names, letter sounds, CV and CVC blends by preschool-aged students in a Head Start program. Results showed the intervention group improved in all areas, while the control group improved only in letter naming and letter sounds. This study discusses reading as a behavioral cusp as well as limitations, and recommendations for future research.
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Osley, Kristin R. Ellis Janet. "A head start on reading for children in a head start preschool program." [Denton, Tex.] : University of North Texas, 2009. http://digital.library.unt.edu/permalink/meta-dc-10985.

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7

Armijo, Eduardo J. "Head Start performance standards and their relationship to key Early Head Start programs aims /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/7733.

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8

Lacy, Gary Lee. "Head Start Social Services: Experiences, Perceptions, And Benefits From the Perspective of Head Start Mothers." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30621.

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Project Head Start, a federal child development program for low-income families,serves both the mother and her children. Previous studies have emphasized Head Start's influence on the child in terms of cognitive gains, social development, and social-emotional development. A continuing problem to understanding the extent of Head Start impact on families is the absence of reliable information about Head Start's influence on the mother and how that influence transfers to the family as they work toward self-sufficiency. This study investigated two issues: (1) the experiences, perceptions, and levels of involvement of mothers who participate in Head Start social services, and (2) how these mothers describe their benefits and relate these benefits to family experiences such as increased problem-solving, coping, and parenting skills. A multiple case study methodology was selected because of its flexibility to allow the researcher to follow new leads that emerged. Participants met three criteria: (1) enrollment in a Head Start social services program for at least six months, (2) willingness to sign an informed consent form and participate in three 90-minute interviews, and (3) having at least one child currently enrolled in Head Start. A participant pool of 17 African American mothers was constituted from parents enrolled in one of three Head Start programs in the Washington, D.C. area, and a sample of eight mothers was then selected for in-depth study. Each mother was interviewed three times, and data were drawn from these interviews. The findings of this study suggest that participation in Head Start social services may have important benefits for mothers and their children. Mothers had developed increased coping and problem-solving skills as well as increased leadership and organizational skills. The findings also suggest that participation in parent group meetings had an empowering influence that prompted several mothers to become involved in certain community activities and in their children's education.
Ph. D.
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9

Kowalski, Ann M. "Project Head Start past, present, and future /." Instructions for remote access. Click here to access this electronic resource. Access available to Kutztown University faculty, staff, and students only, 1994. http://www.kutztown.edu/library/services/remote_access.asp.

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Thesis (M.P.A.)--Kutztown University of Pennsylvania, 1994.
Source: Masters Abstracts International, Volume: 45-06, page: 2947. Abstract precedes thesis as [1] preliminary leaf. Typescript. Includes bibliographical references (leaves 78-80).
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10

Jermyn, Adam Sean. "Turbulence and transport in stars and planets." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/278021.

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In this dissertation I have argued that the study of stars and gaseous planets has relied too heavily on simplifying assumptions. In particular, I have demonstrated that the assumptions of spherical symmetry, thermal equilibrium, dynamical equilibrium and turbulent anisotropy all hide interesting phenomena which make a true difference to the structure and evolution of these bodies. To begin I developed new theoretical tools for probing these phenomena, starting with a new model of turbulent motion which accounts for many different sources of anisotropy. Building on this I studied rotating convection zones and determined scaling relations for the magnitude of differential rotation. In slowly-rotating systems the differential rotation is characterised by a power law with exponent of order unity, while in rapidly-rotating systems this exponent is strongly suppressed by the rotation. This provides a full characterisation of the magnitude of differential rotation in gaseous convection zones, and is in reasonable agreement with a wide array of simulations and observations. I then focused on the convection zones of rotating massive stars and found them to exhibit significantly anisotropic heat fluxes. This results in significant deviations from spherical symmetry and ultimately in qualitatively enhanced circulation currents in their envelopes. Accordingly, these stars ought to live much longer and have a different surface temperature. This potentially resolves several outstanding questions such as the anomalously slow evolution of stars on the giant branch, the dispersion in the observed properties of giant stars and the difficulty stellar modelling has to form massive binary black holes. In the same vein I examined the convection zones of bloated hot Jupiters and discovered a novel feedback mechanism between non-equilibrium tidal dissipation and the thermal structure of their upper envelopes. This mechanism stabilises shallow radiative zones against the convective instability, which would otherwise take over early on in the planet's formation as it proceeds to thermal equilibrium. Hence tidal dissipation is dramatically enhanced, which serves to inject significant quantities of heat into the upper layers of the planet and causes it to inflate. This mechanism can explain most of the observed population of inflated planets. Finally, I studied material mixing in the outer layers of accreting stars and developed a method for relating the observed surface chemistry to the bulk and accreting chemistries. This enables the direct inference of properties of circumstellar material and accretion rates for a wide variety of systems.
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Книги з теми "Star heat"

1

United States. National Aeronautics and Space Administration., ed. Passively adaptive inflatable structure for the Shooting Star Experiment. [Washington, D.C: National Aeronautics and Space Administration, 1998.

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2

Sherman, Josepha. Vulcan's Heart: Star Trek. New York: Pocket Books, 1999.

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3

Brenda, Jackson. Star of his heart. Waterville, Me: Thorndike Press, 2010.

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4

United, States Congress Senate Committee on Labor and Human Resources Subcommittee on Children Family Drugs and Alcoholism. The administration proposal for Head Start reauthorization: Joint hearing before the Subcommittee on Children, Family, Drugs, and Alcoholism of the Committee on Labor and Human Resources, United States Senate and the Subcommittee on Education and Labor, House of Representatives, One Hundred Third Congress, second session on examining Head Start and the administration's plans for expanding and improving it, February 10, 1994. Washington: U.S. G.P.O., 1994.

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5

United States. Congress. House. Committee on Education and Labor. Subcommittee on Human Resources., ed. The administration proposal for Head Start reauthorization: Joint hearing before the Subcommittee on Children, Family, Drugs, and Alcoholism of the Committee on Labor and Human Resources, United States Senate and the Subcommittee on Education and Labor, House of Representatives, One Hundred Third Congress, second session on examining Head Start and the administration's plans for expanding and improving it, February 10, 1994. Washington: U.S. G.P.O., 1994.

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6

United States. Congress. House. Committee on Education and Labor. Subcommittee on Human Resources. Oversight hearing regarding the Head Start Program: Hearing before the Subcommittee on Human Resources of the Committee on Education and Labor, House of Representatives, One Hundred Third Congress, first session, hearing held in Downey, CA, April 8, 1993. Washington: U.S. G.P.O., 1993.

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7

Robb, Brian J. Heath Ledger: Hollywood's dark star. Prahram, Vic: Hardie Grant Books, 2008.

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8

Heath Ledger: Hollywood's dark star. London: Plexus, 2008.

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9

Staff, parents, and politics in Head Start: A case study in unequal power, knowledge, and material resources. New York: Falmer Press, 2000.

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10

Improving Head Start for America's children: Hearing before the Subcommittee on Early Childhood, Elementary and Secondary Education, Committee on Education and Labor, U.S. House of Representatives, One Hundred Tenth Congress, first session, hearing held in Washington, D.C., February 28, 2007. Washington: U.S. G.P.O., 2007.

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Частини книг з теми "Star heat"

1

Yuan, Leqi, Kun Cheng, Haozhi Bian, Yaping Liao, and Chenxi Jiang. "Numerical Simulation of Flow Boiling Heat Transfer in Helical Tubes Under Marine Conditions." In Springer Proceedings in Physics, 1015–30. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_86.

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AbstractLead-based cooled reactors in most countries and some small reactors at sea use helical tube steam generators. Compared with U-tubes, the convection heat transfer coefficient in the spiral tube is higher, the structure is more compact, and the secondary flow is generated under the action of centrifugal force and gravity, which can achieve the effect of wetting the inner wall of the tube. However, due to the importance of the steam generator in the reactor and the complexity of the flow and boiling in the helical tube, the aggregation behavior of bubbles, the distribution of the two-phase interface and the secondary flow in the tube will significantly affect the heat transfer characteristics, so the gas-liquid phase in the tube is studied. Distribution, changes in heat transfer coefficients, and fluid flow characteristics are very important.In order to study the boiling heat transfer characteristics of helical once-through steam generators under static and marine conditions to provide safe and reliable energy supply for offshore facilities such as marine floating, this study uses STAR-CCM+ software, VOF method and Rohsenow boiling model to study the heat transfer capacity and flow characteristics of flow boiling in a helical tube under swaying and tilting conditions. The gas-liquid phase distribution characteristics, secondary flow variation characteristics and convective heat transfer coefficient of the fluid under different swing functions and inclined positions are obtained by numerical calculation, and the law of physical parameters changing with the cycle is found. The research results show that the secondary flow and heat transfer capacity in the tube change with the cycle, and the change is most obvious at the tube length of 0.8m. 5% of the normal condition; when the inclination angle is 45°, the maximum increase of the convection heat transfer coefficient is 16.8%, and the maximum decrease is 6.6%.
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2

Burton, Ralph A. "Start-Up." In Heat, Bearings, and Lubrication, 136–44. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1248-5_17.

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3

Sullivan, Patrick. "Head Start." In Economic Inequality, Neoliberalism, and the American Community College, 71–73. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-44284-6_9.

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4

Barterian, Justin A., Andy V. Pham, and John S. Carlson. "Head Start." In Encyclopedia of Child Behavior and Development, 733–34. Boston, MA: Springer US, 2011. http://dx.doi.org/10.1007/978-0-387-79061-9_1327.

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5

McWayne, Christine, Linnie Green, and Katherine Cheung. "Head Start." In Encyclopedia of Cross-Cultural School Psychology, 493–95. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-0-387-71799-9_190.

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6

Maxwell, Christine B. "Head start." In Encyclopedia of psychology, Vol. 4., 75–78. Washington: American Psychological Association, 2000. http://dx.doi.org/10.1037/10519-034.

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7

McKnight, Caroline. "Early Head Start." In Encyclopedia of Child Behavior and Development, 549–50. Boston, MA: Springer US, 2011. http://dx.doi.org/10.1007/978-0-387-79061-9_928.

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Boyce, Cheryl A., and Louisa Banks Tarullo. "Early Head Start." In Encyclopedia of Cross-Cultural School Psychology, 399–400. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-0-387-71799-9_146.

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9

Bojani, Katarina, Juraj Sprung, and Toby N. Weingarten. "Jump Start My Heart." In A Case Approach to Perioperative Drug-Drug Interactions, 615–18. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-7495-1_136.

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10

Johnson, Brad, and Hal Bowman. "Stay Young at Heart." In Dear Teacher, 14. New York, NY: Routledge, 2021. | Identifiers: LCCN 2020043269 (print) | LCCN 2020043270 (ebook) | ISBN 9780367645809 (hardback) | ISBN 9780367622213 (paperback) | ISBN 9781003125280 (ebook): Routledge, 2021. http://dx.doi.org/10.4324/9781003125280-12.

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Тези доповідей конференцій з теми "Star heat"

1

Coyle, Carolyn, Harry O’Hanley, Bren Phillips, Jacopo Buongiorno, and Thomas McKrell. "Effects of Hydrophobic Surface Patterning on Boiling Heat Transfer and Critical Heat Flux of Water at Atmospheric Pressure." In ASME 2013 Power Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/power2013-98146.

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The effects of hydrophilic/hydrophobic surface patterning on critical heat flux (CHF) and heat transfer coefficient (HTC) were studied using custom-engineered testing surfaces. Patterning was created over a sapphire substrate and tested in a pool boiling facility in MITs Reactor Hydraulics Laboratory. The hydrophilic and hydrophobic matrices were created using layer by layer deposition of 50 nm thick SiO2 nanoparticles and monolayer thickness fluorosilane, respectively. Ultraviolet ozone patterning was then used with chrome-printed masks to create the desired geometric features. Hexagon, ring, star, and mixed patterns were tested to determine their abilities to affect CHF and HTC through prevention of bubble pinning at high heat fluxes. During testing, an infrared camera was used to measure the surface temperature distribution as well as locate nucleation sites for data analysis. It was found that CHF values were enhanced over the bare sapphire values by approximately 90% for hexagons, 60% for stars, 65% for rings, and 50% for mixed patterns. Contrary to expectations, patterning did not seem to affect the HTC values significantly. Although patterning did improve CHF performance over bare heaters, both CHF and HTC were found to be statistically similar to those for unpatterned, uniformly hydrophilic surfaces.
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2

Vegendla, Prasad, and Rui Hu. "Modeling and Simulations of Deteriorated Turbulent Heat Transfer in Wall Heated Cylindrical Tube." In ASME 2019 Verification and Validation Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/vvs2019-5114.

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Abstract The paper discusses the modeling and simulations of Deteriorated Turbulent Heat Transfer (DTHT) for a wall-heated fluid flows, which can be observed in gas-cooled nuclear power reactors during Pressurized Conduction Cooldown (PCC) event due to loss of force circulation flow. The DTHT regime is defined as the deterioration of normal turbulent heat transport due to increase of acceleration and buoyancy forces. The Computational Fluid Dynamics (CFD) tools such as Nek5000 and STAR-CCM+ can help to analyze the DTHT phenomena in reactors for efficient thermal-fluid designs. 3D CFD non-isothermal modeling and simulations were performed in a wall-heated circular tube. The simulation results were verified with two different CFD tools, Nek5000 and STAR-CCM+, and validated with an experimental data. The predicted bulk temperatures were identical in both CFD tools, as expected. Good agreement between simulated results and measured data were obtained for wall temperatures along the tube axis using Nek5000. In STAR-CCM+, the under-predicted wall temperatures were mainly due to higher turbulence in the wall region. In STAR-CCM+, the predicted DTHT was over 48% at outlet when compared to inlet heat transfer values.
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3

Koizumi, Y., T. Okuyama, and H. Ohtake. "Study on Heat Transfer and Flow Behavior of Mini-Tube Bank for Micro Heat Exchanger." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14626.

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Heat transfer and flow behavior in the mini tube bank were examined. The tube bank was composed of 1 mm diameter nickel wires and a 30 mm wide × 15 mm high flow channel. Experiments were performed in the range of the rod Re = 5 ~ 430 by using water. Numerical analyses were also conducted with the commercial CFD code STAR-CD. The heat transfer coefficient after the second row was lower than first row's one. The flow visualization results indicated that the wake region was stagnant when the Reynolds number was low. This flow stagnation seemed to cause the heat transfer coefficient deterioration in the tube bank. As the Reynolds number was increased, the flow state in the wake region gradually changed from the stagnant condition to the more disturbed condition. The deeper the row was, the more disturbed the wake was. The heat transfer coefficient began to recover to the first row value at certain Reynolds number. The recovery started from the most downstream row; fifth row in the present experiments and was propagated to the upstream row. The Reynolds number when the recovery was initiated decreased as the spacing between rods was increased. The analytical results of the STAR-CD code supported the experimental results. When the wake was stagnant, the heat transfer coefficient distribution around the rear rod, i.e. the rod in the wake, showed a large dip in the front region of the rod. It was considered that this dip caused the heat transfer coefficient decrease after the second row observed in the experiments.
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4

McDonough, J. M., and Andrew Loh. "Simulation of Vorticity-Buoyancy Interactions in Fire-Whirl-Like Phenomena." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47548.

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In this study the commercial flow code STAR-CD has been used to simulate a laboratory experiment involving a so-called fire whirl. Such phenomena are typically characterized as exhibiting significantly enhanced mixing and consequently higher combustion rates due to an interaction of buoyancy and vorticity, but the details of this are only beginning to be understood. The present study focuses attention on this interaction in the absence of combustion, thus removing significant complications and allowing a clearer view of the vorticity-buoyancy interaction itself.
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5

Bisnovatyi-Kogan, Gennady, and Maria Glushikhina. "Kinetic theory of the heat conductivity in the crust of a magnetized neutron star." In XII Multifrequency Behaviour of High Energy Cosmic Sources Workshop. Trieste, Italy: Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.306.0040.

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6

Sarkar, Debasis, and N. K. Bhattacharya. "Approximate Analysis Of Transient Heat Conduction In An Induction Motor During Star-Delta Starting." In 2006 IEEE International Conference on Industrial Technology. IEEE, 2006. http://dx.doi.org/10.1109/icit.2006.372592.

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7

Papp, Vera, Andrea Pucciarelli, Medhat Sharabi, and Walter Ambrosini. "Use of Algebraic Heat Flux Models to Improve Heat Transfer Predictions for Supercritical Pressure Fluids." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60298.

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This work proposes simulations of heat transfer under supercritical pressure conditions showing improvements with respect to previous works. This is obtained by the introduction of the Algebraic Heat Flux Model (AHFM) for evaluating the turbulent heat flux in turbulence production terms, using the in-house code THEMAT and the STAR-CCM+ code. The first code makes use of the AHFM also in the energy balance equations, while for the commercial code simplifying assumptions are considered in the implementations. Custom sets of parameters for every condition of inlet temperature and internal diameter are tuned in some cases, driven by the opinion that a single set of parameters cannot be suitable in every flow conditions, considering the complexity of the variables that concur in the heat transfer deterioration phenomenon. The AHFM model gives promising results with new sets of parameters in order to model the deterioration and the recovery phases because of its term related to the variance of temperature.
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8

Bentley, Jonathan, and Jie Cui. "Heat Transfer Modeling in a Double Wall Helical Coil Heat Exchanger." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50542.

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Double wall helical coil heat exchangers are widely used in a variety of applications. These heat exchangers are used anywhere that requires an added layer of protection from cross-fluid contamination such as in indirect water heaters. Here, the coil is heating a potable water tank with coil water which is often infused with a glycol mixture. Since contamination of the potable water would be detrimental to human health, the added protection of a double wall coil is necessary. Unfortunately, the double wall coil is inherently difficult to design due to unknown intertubular contact. This intertubular contact is hidden in nature and difficult to evaluate by nondestructive means. This paper uses STAR-CCM+ to create a computational fluid dynamic model of the double wall helical coil in respect to GAMA indirect water heater continuous draw test conditions. Using CFD, the model is validated with single wall helical coil Nusselt number correlations determined from experimentation. Then, a parametric study is performed to determine what parameters of the coil can be changed to effectively overcome the intertubular thermal loss. From this study, it is found that tube length has a linear positive relationship with coil output density and can be used to calculate necessary lengths for a desired output. Also, it was found that the experimental Nusselt number correlations identify with the results calculated by the double wall CFD model when intertubular contact percentage is used as a correction factor.
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9

Sienicki, James J., and Plamen V. Petkov. "Passive Safety of the STAR-LM HLMC Natural Convection Reactor." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22290.

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The STAR-LM 300 to 400 MWt class modular, factory fabricated, fully transportable, proliferation resistant, autonomous, reactor system achieves passive safety by taking advantage of the intrinsic benefits of inert lead-bismuth eutectic heavy liquid metal coolant, 100+% natural circulation heat transport, a fast neutron spectrum core utilizing high thermal conductivity transuranic nitride fuel, redundant passive air cooling of the outside of the guard/containment vessel driven by natural circulation, and seismic isolation where required by site conditions. Postulated loss-of-heat sink without scram, overcooling without scram, and unprotected transient overpower accidents are analyzed for the 300 MWt STAR-LM design using a coupled thermal hydraulics-neutron kinetics plant dynamics analysis computer code. In all cases, STAR-LM is calculated to exhibit passive safety with peak cladding and coolant temperatures remaining within the existing database for lead-bismuth eutectic coolant and ferritic steel core materials.
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10

Safarov, Jasur, Shakhnoza Sultanova, Gani Dadayev, Sunil Verma, and Alisher Azimov. "Research and analysis of new technologies for drying food products in the heat and mass transfer module." In PROCEEDING OF THE 7TH INTERNATIONAL CONFERENCE OF SCIENCE, TECHNOLOGY, AND INTERDISCIPLINARY RESEARCH (IC-STAR 2021). AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0110511.

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Звіти організацій з теми "Star heat"

1

Ehud Greenspan. STAR: The Secure Transportable Autonomous Reactor System - Encapsulated Fission Heat Source. Office of Scientific and Technical Information (OSTI), October 2003. http://dx.doi.org/10.2172/816808.

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2

Greenspan, Ehud. STAR: The Secure Tranportable Autonomous Reactor system, Encapsulated Fission Heat Source. Progress report for period terminating March 31, 2000. Office of Scientific and Technical Information (OSTI), April 2000. http://dx.doi.org/10.2172/761826.

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3

Carson, Jessica. Maine Head Start Report: 2017. University of New Hampshire Libraries, 2017. http://dx.doi.org/10.34051/p/2020.301.

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4

Currie, Janet, and Duncan Thomas. Does Head Start Help Hispanic Children? Cambridge, MA: National Bureau of Economic Research, October 1996. http://dx.doi.org/10.3386/w5805.

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5

Garces, Eliana, Duncan Thomas, and Janet Currie. Longer Term Effects of Head Start. Cambridge, MA: National Bureau of Economic Research, December 2000. http://dx.doi.org/10.3386/w8054.

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6

Currie, Janet, and Duncan Thomas. Does Head Start Make a Difference? Cambridge, MA: National Bureau of Economic Research, July 1993. http://dx.doi.org/10.3386/w4406.

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7

Gibbs, Chloe, Jens Ludwig, and Douglas Miller. Does Head Start Do Any Lasting Good? Cambridge, MA: National Bureau of Economic Research, September 2011. http://dx.doi.org/10.3386/w17452.

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8

Ludwig, Jens, and Deborah Phillips. The Benefits and Costs of Head Start. Cambridge, MA: National Bureau of Economic Research, March 2007. http://dx.doi.org/10.3386/w12973.

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9

Bitler, Marianne, Hilary Hoynes, and Thurston Domina. Experimental Evidence on Distributional Effects of Head Start. Cambridge, MA: National Bureau of Economic Research, August 2014. http://dx.doi.org/10.3386/w20434.

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10

Jang, J. H., A. Faghri, W. S. Chang, and E. T. Mahefkey. Mathematical modeling and analysis of heat pipe start-up from the frozen state. Office of Scientific and Technical Information (OSTI), August 1989. http://dx.doi.org/10.2172/10180649.

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