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Relevant bibliographies by topics / Heat transfer mechanisms

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Academic literature on the topic 'Heat transfer mechanisms'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 November 2024

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Journal articles on the topic "Heat transfer mechanisms"

1

Roh, Heui-Seol. "Heat transfer mechanisms in solidification." International Journal of Heat and Mass Transfer 68 (January 2014): 391–400. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.09.034.

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Roh, Heui-Seol. "Heat transfer mechanisms in pool boiling." International Journal of Heat and Mass Transfer 68 (January 2014): 332–42. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.09.037.

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Gonzalez, Miguel, Brian Kelly, Yoshikazu Hayashi, and Yoon Jo Kim. "Heat transfer mechanisms in pulsating heat-pipes with nanofluid." Applied Physics Letters 106, no. 1 (January 5, 2015): 013906. http://dx.doi.org/10.1063/1.4905554.

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Wang, Songqing, Yuxuan Ji, Shijing He, Jing Gao, Yao Wang, and Xuelong Cai. "Study on heat transfer performance of a ground heat exchanger under different heat transfer mechanisms." Case Studies in Thermal Engineering 51 (November 2023): 103571. http://dx.doi.org/10.1016/j.csite.2023.103571.

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Bu, Chang-sheng, Dao-yin Liu, Xiao-ping Chen, Cai Liang, Yu-feng Duan, and Lun-bo Duan. "Modeling and Coupling Particle Scale Heat Transfer with DEM through Heat Transfer Mechanisms." Numerical Heat Transfer, Part A: Applications 64, no. 1 (July 2013): 56–71. http://dx.doi.org/10.1080/10407782.2013.772864.

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Melerus, Otto, and Wolfgang Mattmann. "Heat transfer mechanisms in gas fluidized beds. Part 1: Maximum heat transfer coefficients." Chemical Engineering & Technology 15, no. 3 (June 1992): 139–50. http://dx.doi.org/10.1002/ceat.270150302.

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SAKAI, Hideaki, Shigemitsu MARUNO, Shinji NATSUKAWA, Manabu OGURA, and Takayuki INOUE. "Science Education Support Class “Heat Transfer Mechanisms”." Journal of JSEE 59, no. 2 (2011): 11–15. http://dx.doi.org/10.4307/jsee.59.2_11.

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Rogachev, M. S., M. Yu Shtern, and Yu I. Shtern. "Mechanisms of Heat Transfer in Thermoelectric Materials." Nanobiotechnology Reports 16, no. 3 (May 2021): 308–15. http://dx.doi.org/10.1134/s2635167621030162.

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O'neill, Graham. "The caloric stimulus: mechanisms of heat transfer." British Journal of Audiology 29, no. 2 (January 1995): 87–94. http://dx.doi.org/10.3109/03005369509086585.

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Zelenko, V. L., and L. I. Kheifets. "Thermodynamic Way of Ranking Heat-Transfer Mechanisms." Russian Journal of Physical Chemistry A 93, no. 7 (July 2019): 1217–20. http://dx.doi.org/10.1134/s0036024419070343.

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Dissertations / Theses on the topic "Heat transfer mechanisms"

1

Hatton, Andrew. "Investigation into the convective heat transfer mechanisms in enclosures." Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250683.

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Eriksson, Erik. "Investigation of heat transfer and kinetic mechanisms in olefin polymerisation." Lyon 1, 2005. http://www.theses.fr/2005LYO10041.

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Lorsque la modélisation de la polymérisation des oléfines en phase gaz est envisagée, deux points doivent être étudiés, à savoir le transfert de chaleur et la cinétique de réaction. Le transfert de chaleur au sein d'une particule de polymère en croissance est contrôlé par plusieurs phénomènes tels que les interactions entre particules et/ou avec la paroi du réacteur, l'hydrodynamique, etc. Aux vues des risques de surchauffe de la particule au début de la polymérisation (le flux de chaleur volumétrique diminue rapidement lors de la croissance de la particule), l'étude se concentrera sur l'évolution de la température au sein d'une particule hautement réactive placée dans des configurations différentes, par exemple en contact ou non d'autres particules. La modélisation révèle que les interactions entre une petite particule très active et une grande moins active sont principalement gouvernées par les conditions hydrodynamiques aux environs de ces dernières. Ce phénomène est du à la formation d'une couche limite autour des particules solides qui affecte le transfert de chaleur. Cette étude nous a également permis de mettre en exergue l'importance de la prépolymérisation. En effet, celle-ci permet de réduire de manière considérable la température de la particule et donc les risques de surchauffe. Enfin, l'augmentation du diamètre initial de la particule augmente les possibilités de surchauffe. Concernant les interactions entre les particules de polymères en croissance et la paroi du réacteur, elles dépendent du diamètre initial de la particule mais aussi de la nature de la paroi. Les matériaux ayant une conductivité plus grande que le polymère (métal et verre) évacuent mieux la chaleur que ceux qui ont une conductivité plus faible. L'augmentation du diamètre initial semble accentuer cette observation. Finalement, la surface de contact entre la particule de polymère et la paroi du réacteur n'a que très peu d'influence sur la température de la particule. La partie expérimentale, où deux types de catalyseur Ziegler- Natta sont testés, montre que lors d'une polymérisation en conditions douces, la morphologie du polymère finale est fixée après seulement quelques minutes de réaction. En ce qui concerne l'activité, l'augmentation de la température et de la concentration en monomère, permet une activation plus rapide du catalyseur. L'addition d'hydrogène, quant à elle permet à la fois d'accentuer l'activation et la désactivation du catalyseur. Finalement, les propriétés final du polymère (cristallinité, température de fusion. . . ) restent plus ou moins constante quelque soit les conditions. Enfin, des mesures de distribution de masses moléculaires et de composition chimique one été réalisées afin de comprendre comment les conditions réactionnelles les affectent. Ces données sont utilisées, via un deconvolution des valeurs, pour déterminer le nombre de sites actives de chacun des deux catalyseurs. La comparaison de la deconvolution des masses moléculaires er de la composition chimique permet de suivre l'évolution de la composition au cours de la polymérisation. Pour finir, nous avons montré que la présence d'une concentration élevée h'hydrogène ou de comonomère élargie la distribution des masses moléculaires alors qu'à faible concentration d'hydrogène celle-ci devient étroite

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Rudemiller, Gary R. "A fundamental study of boiling heat transfer mechanisms related to impulse drying." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/5757.

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Többen, Dennis [Verfasser]. "Heat Transfer Mechanisms in Steam Turbines During Warm-Keeping Operation / Dennis Többen." München : Verlag Dr. Hut, 2019. http://d-nb.info/1202168604/34.

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Brautsch, Andreas H. "Heat transfer mechanisms during the evaporation process from mesh screen porous structures." Thesis, Heriot-Watt University, 2002. http://hdl.handle.net/10399/396.

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Simpson, A. J. "Some aspects of heat transfer mechanisms in porous materials used in the build environment." Thesis, University of Salford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376867.

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Tyson, Shelly. "Magma-cryosphere interactions on Mars : the influence of heat-transfer mechanisms on surface morphology." Thesis, Lancaster University, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727389.

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Mars is thought to have a planet-wide cryosphere of several kilometres depth consisting of a mixture of rock and permanently frozen ice. The physical processes occurring during magma-cryosphere interaction (MCI) appear to have played a large part in the morphological development of many regions of Mars. The aim of this thesis was to investigate the physical and thermal processes that may take place X during non-explosive MCI. A mass-balance heat-flow model was developed to determine if MCIs could have independently resulted in the formation of features seen on Mars. Laboratory analogue experiments were used to investigate the effects resulting from the heating of a cryosphere analogue over a range of conditions. Two phase (solid particles and liquid water or air) and three phase (solid particles of sand or ice, liquid water and steam) systems were investigated. This enabled the identification of several heat transfer mechanisms; the dominance of these mechanisms varied with the conditions in each experiment. The influence of different heat transfer mechanisms on the development of surface features was also studied. This research has highlighted the complexity of the heat transfer mechanisms and physical interactions that take place during non-explosive magma-cryosphere processes on Mars. We have determined that heat transfer mechanisms can have a significant directional component that results in specific experimental surface morphologies. Similarity to Martian landforms provides insight into their formation mechanisms. This research provides constraints to assist identification and classification of newly discovered landforms within Mars’ landscape.

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Kapembwa, Michael. "Heat and mass transfer effects of ice growth mechanisms in water and aqueous solutions." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/11180.

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Research into ice crystallization processes is an important area of study. The desire to improve product quality and efficiency of processes involving ice crystallization in industries such as desalination by freezing, freeze drying, freeze concentration and freeze crystallization for food processing, requires insight into the ice growth mechanisms. More so, a novel technology called Eutectic Freeze Crystallization, where water is recovered in the form of ice, requires that ice crystals are of high purity as this directly determines the quality of the water obtained. During ice crystallization, ice growth mechanisms play an important role in determining the structure, size and morphology of ice which have an effect on separation processes and product purity. Heat and mass transfer play a fundamental role in ice growth processes as they affect the thermodynamics and kinetics of the crystallization process. Ice growth experiments were carried out in pure water, in 8.4 wt% and 16.8 wt% magnesium sulphate and in 8.4 wt% sodium nitrate using a 10x5x31 mm test cell made of Plexi-glass®. The Colour Schlieren optical technique was used to conduct the experiments. This is because of its capability to map refractive index gradients related to either temperature or/and concentration gradients of the solution during crystal growth.

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Fraser, Neil James. "Mechanisms for wintertime fjord-shelf heat exchange in Greenland and Svalbard." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31289.

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No region has felt the effects of global climate change more acutely than the cryosphere, which has changed at an unprecedented rate in the past two decades. The scientific consensus is that these changes are driven largely by increasing ocean heat content at high latitudes. In southeast Greenland, acceleration and retreat of the marine-terminating glaciers contributes significantly towards global sea level rise. Circulation in the fjords which accommodate these glaciers is thought to be driven both by freshwater input and by barrier wind-driven shelf exchange. Due to a scarcity of data, particularly from winter, the balance between these two mechanisms is not fully understood. In Svalbard, increasing water temperature has decimated sea ice cover in many of the fjords, and had substantial implications for the local ecosystem. While there is a relatively comprehensive literature on shelf exchange mechanisms in Svalbard fjords, questions remain over how the internal circulation interacts with exchange mechanisms. The region shares a similar underwater topography and oceanographic setting with southeast Greenland, with marine-terminating glaciers in close proximity to warm Atlantic waters, and results from Svalbard can hence be used to inform studies of high-latitude fjord-shelf exchange in a broader context. A realistic numerical model was constructed with the aim of better understanding the interaction between Kangerdlugssuaq Fjord and the adjacent continental shelf, and quantifying heat exchange during winter. The model was initially run in an idealised configuration with winter climatological forcing fields, incorporating a parameterisation for melting at the terminus, and used to test the impact of barrier wind events. The Earth's rotation played a crucial role in the nature of the circulation and exchange in the fjord, with inflow on the right (looking up-fjord) and outflow on the left. While the heat delivered into the fjord-mouth was smaller than that observed in summer, the background internal circulation was found to efficiently distribute waters through the fjord without external forcing, and the heat delivered to the glacier terminus was comparable to summer values. Barrier winds were found to excite coastally-trapped internal waves which propagated into the fjord along the right-hand side. The process was capable of doubling the heat delivery. The process also enhanced the background circulation, likely via Stokes' Drift. The model was then adapted to simulate winter 2007-08 under historical forcing conditions. Time series of glacial melt rate, as well as the heat flux through fjord cross-sections, were constructed and compared to the variability in wind forcing. Long periods of moderate wind stress were found to induce greatly enhanced heat flux towards the ice sheet, while short, strong gusts were found to have little influence, suggesting that the timescale over which the shelf wind field varies is a key parameter in dictating wintertime heat delivery from the ocean to the Greenland Ice Sheet. An underwater glider was deployed to Isfjorden, a large fjord system in Svalbard, to measure the temperature, salinity and depth-averaged currents over the course of November 2014. Like in Kangerdlugssuaq, the circulation in Isfjorden was found to be heavily influenced by the Earth's rotation and by wind activity both locally and on the shelf. The combination of hydrography and high-resolution velocity data provided new insights, suggesting that the approach will be useful for studying high-latitude fjords in the future.

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Machado, Jean Fernando Bertão. "Reynolds number effect on the heat transfer mechanisms in aircraft hot air anti-ice system." Instituto Tecnológico de Aeronáutica, 2008. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=1158.

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The primary means of preventing ice formation on wings and engine inlets for modern commercial transport aircraft is by extracting hot air from the compressor and blowing it on the inside surface of the leading edge through small holes drilled in the so-called piccolo tube system. A critical aspect in the design of such system is the prediction of heat transfer of the impinging jets from the piccolo tube. The correct evaluation of the heat transfer rate in such devices is of great interest to optimize both the anti-icing performance and the hot air bleeding from the high-pressure compressor. The history of research in the anti-icing area is rather narrow. A review of the literature reveals that only few experimental and theoretical/numerical studies have been carried out to study the heat transfer and flow in the internal hot-air region. There are some experimental and numerical studies that developed correlations for the average Nusselt number. However, most of the research was performed using a single jet or a group of jets impinging on a flat slat, which is different from the jet impingement on concave surfaces, as the inside surface of a wing. Therefore, the objective of the present work is use the commercial CFD software FLUENT to perform a parametric study of the jet impingement on concave surfaces. The main goal is determine the effect of the Reynolds number on the heat transfer process. At the end of the work, a correlation for the average Nusselt number which account for the Reynolds number is presented.

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Books on the topic "Heat transfer mechanisms"

1

John, Benton, Kucner Robert, and NASA Glenn Research Center, eds. Subcooled pool boiling heat transfer mechanisms in microgravity: Terrier-improved orion sounding rocket experiment. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2000.

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Simpson, Anthony James. Some aspects of heat transfer mechanisms in porous materials used in the built environment. Salford: University of Salford, 1986.

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R, Gazis Paul, Phillips John L, and United States. National Aeronautics and Space Administration., eds. Constraints on solar wind acceleration mechanisms from Ulysses plasma observations: The first polar pass. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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Oteng-Attakora, George. Mechanisms of heat and mass transfer to and from single drops freely-suspended in an air stream. Birmingham: Aston University. Department of Chemical Engineering and Applied Chemistry, 1995.

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1934-, DeWitt David P., ed. Introduction to heat transfer. 4th ed. New York: Wiley, 2002.

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1934-, DeWitt David P., ed. Introduction to heat transfer. 3rd ed. New York: Wiley, 1996.

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Samarskiĭ, A. A. Computational heat transfer. Chichester: John Wiley & Sons, 1995.

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Samarskiĭ, A. A. Computational heat transfer. Chichester: Wiley, 1995.

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Molerus, O. Heat Transfer in Fluidized Beds. Dordrecht: Springer Netherlands, 1997.

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Wrobel, L. C. Boundary Element Methods in Heat Transfer. Dordrecht: Springer Netherlands, 1992.

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Book chapters on the topic "Heat transfer mechanisms"

1

Ermolaev, Vladimir. "Heat Transfer Mechanisms. Thermal Conductivity." In Foundations of Engineering Mechanics, 117–29. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-50373-3_12.

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Sundén, Bengt. "Flow and Heat Transfer Mechanisms in Plate-and-Frame Heat Exchangers." In Heat Transfer Enhancement of Heat Exchangers, 185–206. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9159-1_11.

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Molerus, O., and K. E. Wirth. "Heat transfer mechanisms in bubbling fluidized beds." In Heat Transfer in Fluidized Beds, 35–47. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5842-8_4.

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Ma, Hongbin. "Oscillating Motion and Heat Transfer Mechanisms of Oscillating Heat Pipes." In Oscillating Heat Pipes, 141–201. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9_4.

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Oresta, Paolo, Roberto Verzicco, Detlef Lohse, and Andrea Prosperetti. "Heat transfer mechanisms in bubbly Rayleigh-Bénard convection." In Springer Proceedings in Physics, 355–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03085-7_86.

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Levenspiel, Octave. "The Three Mechanisms of Heat Transfer: Conduction, Convection, and Radiation." In Engineering Flow and Heat Exchange, 179–210. Boston, MA: Springer US, 2014. http://dx.doi.org/10.1007/978-1-4899-7454-9_9.

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Robilotto, Anthony T., John M. Baust, Robert G. Van Buskirk, and John G. Baust. "Models and Mechanisms of Tissue Injury in Cryosurgery." In Theory and Applications of Heat Transfer in Humans, 591–617. Chichester, UK: John Wiley & Sons Ltd, 2018. http://dx.doi.org/10.1002/9781119127420.ch27.

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Wang, Shiping, Qinghua Yin, Yingke Tan, and Songjiu Deng. "Investigation of Condensation Heat Transfer Enhancement Mechanisms of Particularly-Shaped Fin Tube with Numerial Method." In Heat Transfer Enhancement And Energy Conservation, 357–64. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003575726-43.

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Loufek, J. "Simulations of Radiation Heat Transfer in Design of Alternative Infrared Emitters." In Advances in Mechanisms Design, 231–36. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5125-5_31.

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Kitanovski, Andrej, Jaka Tušek, Urban Tomc, Uroš Plaznik, Marko Ožbolt, and Alojz Poredoš. "Special Heat Transfer Mechanisms: Active and Passive Thermal Diodes." In Magnetocaloric Energy Conversion, 211–67. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08741-2_6.

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Conference papers on the topic "Heat transfer mechanisms"

1

Lee, Ho Sung, and Herman Merte, Jr. "POOL BOILING MECHANISMS IN MICROGRAVITY." In Microgravity Fluid Physics & Heat Transfer. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/mfpht-1999.150.

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Banerjee, Sanjoy. "TURBULENCE STRUCTURE AND TRANSPORT MECHANISMS AT INTERFACES." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.2030.

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Sami, Muhammad, Bekir S. Yilbas, and Ahmet Z. Sahin. "HEAT TRANSFER MECHANISMS GOVERNING LASER-METAL INTERACTIONS." In International Heat Transfer Conference 10. Connecticut: Begellhouse, 1994. http://dx.doi.org/10.1615/ihtc10.1730.

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Meng, H., and Cees W. M. van der Geld. "BUBBLE TRAJECTORIES IN CROSS FLOWS AND WAKE ENTERING MECHANISMS." In International Heat Transfer Conference 10. Connecticut: Begellhouse, 1994. http://dx.doi.org/10.1615/ihtc10.5570.

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Golliher, Eric, Andy Hong, Greg Pace, Barbara Sakowski, Dan Gotti, and Jay Owens. "Evaporative Heat Transfer Mechanisms within a Heat Melt Compactor." In 43rd International Conference on Environmental Systems. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-3392.

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Ganesa-Pillai, Madhu, A. Haji-Sheikh, Madhu Ganesa-Pillai, and A. Haji-Sheikh. "Heat transfer mechanisms in spray cooling under dry wall conditions." In 1997 National Heat Transfer Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-3887.

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Phinney, Leslie M., and Chang-Lin Tien. "RECOVERY MECHANISMS FOR STICTION-FAILED MICROCANTILEVERS USING SHORT-PULSE LASERS." In International Heat Transfer Conference 11. Connecticut: Begellhouse, 1998. http://dx.doi.org/10.1615/ihtc11.250.

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Qu, Wei, Yantao Qu, and Tongze Ma. "Mechanisms of Coupled Heat Transfer and Flow of High Heat Flux Pulsating Heat Pipe." In ASME 2004 2nd International Conference on Microchannels and Minichannels. ASMEDC, 2004. http://dx.doi.org/10.1115/icmm2004-2425.

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The mechanisms of coupled heat transfer and flow are modeled to describe the looped pulsating heat pipe of high heat flux. The latent heat transfer produces the pressure difference between the heating section and cooling section. This can provide the operational driving force to overcome the total flow resistances. While the sensible heat transfer contributes more to the transferred power. The results demonstrate that the circulation flow velocity can balance the heat and mass transfers automatically. And the ratio of latent heat transfer to sensible heat transfer is within 30 percent.

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Tong, W., Avram Bar-Cohen, and Terrence W. Simon. "THERMAL TRANSPORT MECHANISMS IN NUCLEATE POOL BOILING OF HIGHLY-WETTING LIQUIDS." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.50.

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Pawlick, Max, and G. P. "Bud" Peterson. "INVESTIGATION OF MECHANISMS THAT GOVERN PERFORMANCE TRENDS IN OSCILLATING HEAT PIPES." In International Heat Transfer Conference 17. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/ihtc17.200-190.

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Reports on the topic "Heat transfer mechanisms"

1

Campbell, C. S. Mechanics/heat-transfer relation for particulate materials. Office of Scientific and Technical Information (OSTI), October 1990. http://dx.doi.org/10.2172/6424450.

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Campbell, C. S., D. G. Wang, and K. Rahman. Mechanics/heat-transfer relation for particulate materials. Office of Scientific and Technical Information (OSTI), November 1991. http://dx.doi.org/10.2172/5849809.

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Campbell, C. Mechanics/heat-transfer relation for particulate materials. Office of Scientific and Technical Information (OSTI), April 1990. http://dx.doi.org/10.2172/6892213.

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Campbell, C. Mechanics/heat-transfer relation for particulate materials. Office of Scientific and Technical Information (OSTI), October 1989. http://dx.doi.org/10.2172/5394546.

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Wolfenson, David, William W. Thatcher, Rina Meidan, Charles R. Staples, and Israel Flamenbaum. Hormonal and Nutritional Stretegies to Optimize Reproductive Function and Improve Fertility of Dairy Cattle during Heat Stress in Summer. United States Department of Agriculture, August 1994. http://dx.doi.org/10.32747/1994.7568773.bard.

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The BARD program includes two main parts. In the first, experiments were conducted to complete our understanding of the mechanisms responsible for the impairment of reproductive functions under heat stress. Experiments focused on follicular development and function, since results obtained in our previous BARD project indicate that the preovulatory follicle is susceptible to heat stress. The theca cells, sensitive to thermal stress, produced less androgen during the summer, as well as during the autumn. Similarly, luteinized theca cells obtained from cows in summer produced much less progesterone than in winter. Granulosa cells and luteinized granulosa cells were less susceptible to heat stress. A delayed effect of heat stress on follicular development, on suppression of dominance and on steroid production by theca and granulosa cells was noted. This may be related to the low fertility of cows during the cool months of autumn. In the second part, experiments were conducted aiming to improve fertility in summer. The timed AI program was developed using two injections of GnRH coupled with PGF2a. It was found effective in improving reproductive performance in lactating cows. Limitations induced by heat stress on estrus detection were eliminated with the timed AI management program. Replacing the second injection of GnRH with hCG instead of GnRH agonist increased plasma progesterone levels post ovulation but did not improve fertility. Use of the timed AI program in summer, shortened days open and increased the net revenue per cow, however, it did not protect the embryo fiom temperature-induced embryonic mortality. Incorporation of a GnRH-agonist implant into the timed AJ program was examined. The implant increased plasma progesterone and LH concentrations and altered follicular dynamics. The use of a GnRH-implant enhanced pregnancy rate in cows with low body conditions. In a timed embryo transfer experiment, the use of fresh or frozen in vitro produced embryos was compared in the summer to improve fertility. The use of flesh embryos (but not frozen ones) improved pregnancy rate, however, substantial embryonic death occurred between 21 and 45 days. The timed AI program, which is now being used commercially, shortened days open, and increased pregnancy rate during summer. Other approaches which were found to improve fertility in small-scale studies, need to be tested again in large-scale field trials.

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Campbell, C. S. Mechanics/heat-transfer relation for particulate materials. [Quarterly report]. Office of Scientific and Technical Information (OSTI), July 1991. http://dx.doi.org/10.2172/10158919.

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Campbell, C. S. Mechanics/heat-transfer relation for particle flows: Quarterly report. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/6233102.

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Campbell, C. S., D. G. Wang, and K. Rahman. Mechanics/heat-transfer relation for particulate materials. Final report. Office of Scientific and Technical Information (OSTI), November 1991. http://dx.doi.org/10.2172/10122202.

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Campbell, C. S. Mechanics/heat-transfer relation for particulate materials (for July 1991). Office of Scientific and Technical Information (OSTI), July 1991. http://dx.doi.org/10.2172/5248934.

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Wang, Ting. Fluid Mechanics and Heat Transfer in the Transitional Boundary Layer. Fort Belvoir, VA: Defense Technical Information Center, February 1998. http://dx.doi.org/10.21236/ada338920.

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