Relevant bibliographies by topics / High cooling rate

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

Academic literature on the topic 'High cooling rate'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "High cooling rate"

1

Drlička, R., V. Kročko, and M. Matúš. "Machinability improvement using high-pressure cooling in turning." Research in Agricultural Engineering 60, Special Issue (December 30, 2014): S70—S76. http://dx.doi.org/10.17221/38/2013-rae.

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Process fluids are used primarily for their cooling and lubricating effect in machining. Many ways to improve their performance have been proposed; the analysis of some of them is provided in the paper. The effect of high pressure cooling has been investigated with regard to chip formation and tool life. Standard and for high pressure application particularly designed indexable cutting inserts were used with fluid pressure 1.5 and 7.5 MPa. The pressure effect on tool life at different feed rates was observed as well. Not each cooling pressure value or machined material showed favourable chip formation. Tool life though has improved significantly while machining with a lower feed rate. 
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Adamovsky, S. A., A. A. Minakov, and C. Schick. "Scanning microcalorimetry at high cooling rate." Thermochimica Acta 403, no. 1 (June 2003): 55–63. http://dx.doi.org/10.1016/s0040-6031(03)00182-5.

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Imamudeen, Bello, and Shiv Singh. "HIGH-SPEED QUECHING OF HIGH CARBONSTEEL." International Journal of Research -GRANTHAALAYAH 7, no. 12 (June 8, 2020): 25–31. http://dx.doi.org/10.29121/granthaalayah.v7.i12.2019.297.

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Medium and high carbon steels are usually quenched in polymer and oil in order to avoid cracking and distortion; however, recent studies have proved that it is possible to minimize cracking using water as a coolant of these steels by promoting extremely high cooling rates. By great agitation and velocity of quench ant, the vapour blanket is reduced or prevented during water quench, allowing uniform hardening of the surface. In this study, the cooling severity of a spray quenching system and a high-speed quenching chamber are studied. Cylindrical samples of AISI 304 stainless steel (20mm in diameter and 100mm length) were employed to characterize the cooling severity. Thermal data was acquired through K-type thermocouples placed in the sample at three positions, 1mm below surface, mid-radius and at centre of the specimen, connected to a data acquisition system. High thermal gradients were observed in both systems, being the high-speed chamber the severest cooling. The maximum cooling rate obtained at the surface was 470 and 300C/s for the high-speed chamber and the spray system, respectively. In addition, 5160 spring steel samples were quenched for short times in both systems; the cooling was interrupted to avoid through transformation and to produce a case-core type microstructure. Different cooling times were used for the interrupted quenching to modify the marten site case thickness. No cracks.
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Nakata, Naoki, Takashi Kuroki, Akio Fujibayashi, and Yoshio Utaka. "Cooling Performance of High Temperature Steel Plate in Intensive Cooling with High Water Flow Rate." Tetsu-to-Hagane 99, no. 11 (2013): 635–41. http://dx.doi.org/10.2355/tetsutohagane.99.635.

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Su, Fengmin, Hongbin Ma, Xu Han, Hsiu-hung Chen, and Bohan Tian. "Ultra-high cooling rate utilizing thin film evaporation." Applied Physics Letters 101, no. 11 (September 10, 2012): 113702. http://dx.doi.org/10.1063/1.4752253.

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Wang, Chen, Chunhua Wang, and Jingzhou Zhang. "Parametric Studies of Laminated Cooling Configurations: Overall Cooling Effectiveness." International Journal of Aerospace Engineering 2021 (February 10, 2021): 1–15. http://dx.doi.org/10.1155/2021/6656804.

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Combing the advantages of film cooling, impingement cooling, and enhanced cooling by pin fins, laminated cooling is attracting more and more attention. This study investigates the effects of geometric and thermodynamic parameters on overall cooling effectiveness of laminated configuration, and model experiments were carried out to validate the numerical results. It is found that the increases in film cooling hole diameter and pin fin diameter both result in the increase in cooling effectiveness, but the increases in impingement hole diameter, impingement height, and spanwise hole pitch degrade the cooling performance. The increase of the coolant flow rate causes the increase in cooling efficiency, but this effect becomes weaker at a high coolant flow rate. The coolant-to-mainstream density ratio has no obvious effect on cooling effectiveness but affects wall temperature obviously. Moreover, based on the numerical results, an empirical correlation is developed to predict the overall cooling efficiency in a specific range, and a genetic algorithm is applied to determine the empirical parameters. Compared with the numerical results, the mean prediction error (relative value) of the correlation can reach 8.3%.
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Lu, Hai Na, Xiu Hua Gao, Zheng Yi Jiang, Dong Bin Wei, and Xiang Hua Liu. "Development of High Strength Hull Plate by Normal Hot Rolling and High Rate Cooling Process." Advanced Materials Research 148-149 (October 2010): 253–58. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.253.

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This paper investigates the effects of normal hot rolling and high rate cooling (NHR+HRC) on microstructure and mechanical properties of the rolled EH 36 hull plate. Double-hit tests were carried out to study the effect of process parameters such as the deformation temperature and soaking time on microstructures of the tested steel, and explore optimal processing parameters. Single-hit compression with various parameters was developed and the microstructures of the tested steel are analyzed to determine the cooling rate and the final cooling temperature of the normal hot rolling and high rate cooling. This study will provide experimental and theoretical base on high-temperature rolling control system. Industrial trial was performed to produce regular products. The results show that the NHR+HRC is an effective and promising method to improve the product quality of high-strength hull plate.
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De Santis, Felice, Sergey Adamovsky, Giuseppe Titomanlio, and Christoph Schick. "Scanning Nanocalorimetry at High Cooling Rate of Isotactic Polypropylene." Macromolecules 39, no. 7 (April 2006): 2562–67. http://dx.doi.org/10.1021/ma052525n.

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Bardelcik, Alexander, Christopher P. Salisbury, Sooky Winkler, Mary A. Wells, and Michael J. Worswick. "Effect of cooling rate on the high strain rate properties of boron steel." International Journal of Impact Engineering 37, no. 6 (June 2010): 694–702. http://dx.doi.org/10.1016/j.ijimpeng.2009.05.009.

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Zhang, Zhi Min, Wei Yu, and Qing Wu Cai. "Control Basis for Cooling Rate of Plates during Roller Quenching in High-Pressure Zone." Advanced Materials Research 538-541 (June 2012): 2090–94. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.2090.

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A basis based on temperature field is developed to control the cooling rate of plates during roller quenching in high-pressure zone. In order to determine the optimal cooling rate of plate during roller quenching, temperature field of SPV490 plate during quenching was calculated. Then a formula for calculating cooling rate of the center for plate at a certain cooling intensity during roller quenching in high-pressure zone was put forward and the control basis for cooling rate of plate during roller quenching in high-pressure zone was suggested. The cooling rates and corresponding heat transfer coefficients of SPV490 plates with different thickness during roller quenching in high-pressure zone were determined with the given basis.
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Dissertations / Theses on the topic "High cooling rate"

1

Rose, Scott Anthony. "The Effect of Cooling Rate of Friction Stir Welded High Strength Low Alloy Steel." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4181.

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The friction stir welding of steel has produced a hard zone in several different alloys. Despite its detrimental effects on weld toughness, the reasons behind neither its formation nor a method of reducing its size or effects have been explored. Recent advances in process control allow for direct heat input control, which combined with the use of backing plates of different thermal conductivity allows for an expansion of the process window. These control methods also affect the HAZ cooling rate by providing greater range (a 60% increase compared to a fixed backing plate) and control (five welds within 16 °C/s). This increased range produced microstructures consisting of various forms of ferrite at lower cooling rates and bainite at higher cooling rates. The hard zone was determined to be the result of the formation of the bainite at higher cooling rates and was avoided by keeping the cooling rate below 20 °C/s in HSLA-65.
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2

Liu, Qiang. "Control of Wear-Resistance Properties in Ti-added Hypereutectic High Chromium Cast Iron." Licentiate thesis, KTH, Tillämpad processmetallurgi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105854.

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High chromium cast iron (HCCI) is considered as one of the most useful wear resistance materials and their usage are widely spread in industry. The wear resistance and mechanical properties of HCCI mainly depend on type, size, number, morphology of hard carbides and the matrix structure (γ or α). The Hypereutectic HCCI with large volume fractions of hard carbides is preferred to apply in wear applications. However, the coarser and larger primary M7C3 carbides will be precipitated during the solidification of the hypereutectic alloy and these will have a negative influence on the wear resistance. In this thesis, the Ti-added hypereutectic HCCI with a main composition of Fe-17mass%Cr-4mass%C is quantitatively studied based on the type, size distribution, composition and morphology of hard carbides and martensite units. A 11.2μm border size is suggested to classify the primary M7C3 carbides and eutectic M7C3 carbides. Thereafter, the change of the solidification structure and especially the refinement of carbides (M7C3 and TiC) size by changing the cooling rates and Ti addition is determined and discussed. Furthermore, the mechanical properties of hypereutectic HCCI related to the solidification structure are discussed. Mechanical properties of HCCI can normally be improved by a heat treatment process. The size distribution and the volume fraction of carbides (M7C3 and TiC) as well as the matrix structure (martensite) were examined by means of scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD). Especially for the matrix structure, EBSD is a useful tool to classify the fcc (γ) and bcc (α) phases. In conclusion, low holding temperatures close to the eutectic temperature and long holding times are the best heat treatment strategies in order to improve wear resistance and hardness of Ti-alloyed hypereutectic HCCI.

QC 20121130

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3

Ram, Gokul, and Vishnu Harikrishnan. "INFLUENCE OF CARBON CONTENT AND COOLING CONDITIONS ON THE THERMAL CONDUCTIVITY AND TENSILE STRENGTH OF HIGH SILICON LAMELLAR GRAPHITE IRON." Thesis, Tekniska Högskolan, JTH, Material och tillverkning, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-51152.

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Much study has been carried out to determine the properties of Lamellar Graphite Iron (LGI) or grey iron and their relations to factors such as the cooling rate, the dendrite morphology, the pouring temperature, and so on. However, there hasn’t been much comprehensive study on the properties of LGI outside the generally used and accepted composition, with 1 to 3% Silicon. The scope of this study is to measure and evaluate the thermal conductivity and tensile strength of LGI, for a higher concentration of  Si and different carbon contents. The concentration of Si aimed for was 4% but the concentration obtained after spectroscopy was between 4.1% to 4.15%. There are two hypereutectic, one near-eutectic and three hypoeutectic samples considered and these six chemical compositions were cast under different cooling conditions . The cooling time has been varied by providing different molds of 30mm, 55mm, and 80mm diameter cylinders respectively, for all the six sample compositions. The microstructure analysis carried out studies the segregation of Si, the graphite morphology, primary austenite morphology. These factors are then compared to the thermal and tensile behavior measured in this study. It can be observed that the thermal conductivity studied in the present work has a direct correlation for a higher Si content and tends to be greater than the thermal conductivity values observed from other studies with lower content Of Si. However, the conductivity shows an inverse relation with the cooling rate and is maximum for the samples with the lowest cooling rate. The tensile strength, on the other hand, seems to have a lower value than that observed in previous studies for LGI with 1 to 3% Si, but shows a direct correlation with the cooling rate. The mean area fraction of dendrites obtained and the mean interdendritic hydraulic diameter is also measured and their influence on the properties are also studied. The addition of more Si has greatly favored the thermal behavior positively but has also reduced the tensile strength.
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4

Liu, Qiang. "Microstructure Evaluation and Wear-Resistant Properties of Ti-alloyed Hypereutectic High Chromium Cast Iron." Doctoral thesis, KTH, Tillämpad processmetallurgi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-128532.

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High chromium cast iron (HCCI) is considered as one of the most useful wear resistance materials and their usage are widely spread in industry. The mechanical properties of HCCI mainly depend on type, size, number, morphology of hard carbides and the matrix structure (γ or α). The hypereutectic HCCI with large volume fractions of hard carbides is preferred to apply in wear applications. However, the coarser and larger primary M7C3 carbides will be precipitated during the solidification of the hypereutectic alloy and these will have a negative influence on the wear resistance. In this thesis, the Ti-alloyed hypereutectic HCCI with a main composition of Fe-17mass%Cr-4mass%C is studied based on the experimental results and calculation results. The type, size distribution, composition and morphology of hard carbides and martensite units are discussed quantitatively. For a as-cast condition, a 11.2μm border size is suggested to classify the primary M7C3 carbides and eutectic M7C3 carbides. Thereafter, the change of the solidification structure and especially the refinement of carbides (M7C3 and TiC) size by changing the cooling rates and Ti addition is determined and discussed. Furthermore, the mechanical properties of hypereutectic HCCI related to the solidification structure are discussed. Mechanical properties of HCCI can normally be improved by a heat treatment process. The size distribution and the volume fraction of carbides (M7C3 and TiC) as well as the matrix structure (martensite) were examined by means of scanning electron microscopy (SEM), in-situ observation by using Confocal Laser Scanning Microscope (CLSM), Transmission electron microscopy (TEM) and electron backscattered diffraction (EBSD). Especially for the matrix structure and secondary M7C3 carbides, EBSD and CLSM are useful tools to classify the fcc (γ) and bcc (α) phases and to study the dynamic behavior of secondary M7C3 carbides. In conclusion, low holding temperatures close to the eutectic temperature and long holding times are the best heat treatment strategies in order to improve wear resistance and hardness of Ti-alloyed hypereutectic HCCI. Finally, the maximum carbides size is estimated by using statistics of extreme values (SEV) method in order to complete the size distribution results. Meanwhile, the characteristic of different carbides types will be summarized and classified based on the shape factor.

QC 20130913

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5

Tavakoli, Shahab. "Modélisation du cycle thermique des moules de fonderie sous pression." Thesis, Paris 10, 2014. http://www.theses.fr/2014PA100095.

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La réduction de la masse des véhicules, notamment des Groupes Motopropulseurs contribue à la réduction des émissions polluantes. Aujourd’hui afin d’aboutir à cet objectif, la conception de pièces automobiles (Carter Mécanisme, Carter Cylindre) en matériau allégé tel que l’aluminium et ses alliages est en plein essor. Pour la production de grande série, ces alliages sont mis en œuvre par le procédé de fonderie ‘’Aluminium sous pression’’.Ce procédé utilise des moules métalliques. La maîtrise du comportement thermique du moule : chauffage, refroidissement interne (par circuit) et externe, est un point clef pour la qualité et la cadence de production.Dans ce mémoire, le processus industriel est détaillé depuis la fermeture du moule et l’injection du métal liquide jusqu’à l’ouverture du moule et l’extraction de la pièce (carter mécanisme RENAULT). Ensuite, le design détaillé du moule, les différentes générations de circuit de refroidissement et les paramètres de chaque étape de la fabrication utilisés compte tenu du système de refroidissement actuel sont présentés. Le circuit de refroidissement du moule est aujourd’hui positionné dans le moule de façon empirique. Le but ultime de cette thèse est de donner les éléments clés de la conception du circuit de refroidissement d’un point vue thermique. Pour cela, une modélisation complète du phénomène a été réalisée et validée par 8 thermocouples et la position du system de refroidissement a été définie a partir des équations thermiques. Le cycle thermique du moule a été donc optimisé et nous a permis d’abaisser et d’homogénéiser les champs de température à la surface du moule pendant la production en vue d’une augmentation de la productivité, la santé des pièces et la durée de vie du moule
Reducing the weight of vehicles, specially the powertrain Group, contributes to the reduction of the emissions. Today, in order to achieve this objective, the automobile parts conception (Housing gear box, Cylinder block) in lightweight materials such as aluminum and its alloys is increasing. For the mass production, aluminum alloys are formed by a foundry process called ‘’High Pressure Die Casting’’.This process uses the metal molds. Control the thermal behavior of the mold : Heating, intern cooling (by circuit) and extern cooling, is a key point to ensure castings quality and rate of production.In this thesis, the industrial process has been detailed since the mold closing and aluminum melting injection in the die, to the mold opening time and the part (Gearbox RENAULT) ejection. Then, the mold design details, different generation of the cooling systems and the parameters of each step of the manufacturing process taking into account the actual cooling system are presented. The actual cooling systems in the dies are positioned today in empirical way. The ultimate goal of this thesis is to provide the key elements for the cooling system conception from the thermal behavior point of view. For this one, a complete modeling of the phenomena has been realized and validated by 8 thermocouples and the cooling system position has been defined from the thermal equations. The thermal cycle of the die has been optimized and allowed us to reduce and homogenize the temperature fields on the die surface during the production. The rate of production, the castings quality and the lifetime of the die have been consequently increased
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6

Chung, Chao-Nan, and 鍾兆楠. "Development of Advanced High Flow Rate Micro-Cooling Fans." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/54391113884651851749.

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碩士
逢甲大學
機械工程學系
88
The objective of this practice is to develop a technique that can be applied on micro-cooling fans, along with the aerodynamic design, flow analysis and the experimental testing; moreover, to develop a high flow rate micro-cooling fan. Micro-cooling fan (less than 25 mm on the external diameter) is mainly applied on the notebook computers and some other electronic devices. The use is to convey the heat made from the electronic devices through the air, as the medium, to the atmosphere for achieving the purpose of temperature maintenance. Due to the continuously promotional processing rate of the electronic parts at present, the generated heat also increases relatively. Under such demand, a cooling fan must promote its flow rate to attain the goal of temperature maintenance for the electronic parts. In consideration of the lifetime of the related parts in cooling fans and the decreasing of the produced noise, cooling fans will not be able to reach high flow rate by increasing the rotational speed. Therefore, within the limitation of the size and the rotational speed of the cooling fans, it must be done by advancing the aerodynamic characteristics and efficiency for an efficiently improvement of the flow rate. As increasing the flow rate of fans, more pressure rise must be obtained relatively for overcoming the large drag produced by the high velocity. Thus, the design stress of this practice is to increase the pressure rise of the fans, and to develop a micro-cooling fan with high flow rate. To accomplish the goal, this experience has established a set of techniques for micro-cooling fans. Among which, it includes the aerodynamic design, flow analysis, mechanical design, rapid prototyping manufacture, and experimental testing. The techniques would be able to shorten the time from design to testing of micro-cooling fans, and would benefit the developers promptly by obtaining the verification or proceeding to the next step with further advanced designs. Upon the techniques, three types of micro-cooling fans have been developed. Also, the test result has been put into performance comparison with the ones on the present market. The result shows that there is a 24.36% gain on pressure rise, along with a 27.09% more flow rate. At the moment, integrating the result of design, analysis, and testing, a micro-cooling fan with high flow rate has now approached successfully. Finally, I look forward to providing any positive contribution to the related academic research and industrial circles with this presentation.
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7

Lin, Chang-Yi, and 林瑺毅. "The Effect of Cooling Rate on the Eutectoid Reaction of High Silicon Steels." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/17643204093531209334.

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碩士
國立臺灣科技大學
機械工程系
90
This research has aimed to investigate the effect of cooling rate on the eutectoid reaction of high silicon steels. A self designed vacuum heat treating system controlled by personal computer was used to measure the electrical resistivity of high silicon steels during the heat treating in a real-time situation . The characteristic of phase transformation of eutectoid reaction of three high silicon steels with different silicon and carbon contents were studied with different cooling rate, also the hardness test and optical metallographic examination were used to study the microstructures. The experimental results show that: (1) the hardness of high silicon steels after eutectoid reaction was higher for faster cooling rate and lower silicon content; (2) the temperature range of phase transformation and the relative ferrite fraction were affected by silicon content, and both were larger for a higher silicon content; (3) the growth of ferrite was closely related to the cooling rate, a thinner ferrite grain with a faster cooling rate, and a cooling rate of 2℃/s was a critical one for the growth of ferrite.
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8

Sun, Hong-cheng, and 孫宏誠. "The study of strain and cooling rate on the microstructure and high temperature mechanical properties of Cr-Mo steel." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/70376612247412566506.

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碩士
國立高雄大學
化學工程及材料工程學系碩士班
100
This study is focused on a Cr-Mo high-strength steel （SCM440） used as fasteners for Wind Turbine System. The differential Scanning Calorimetry （DSC） was applied to analyze the thermal property. The Gleeble 3500 and Gleeble 1500 hot tensile machines were used to develop the constitutive equation and investigate microstructure evolution to study the hot deformation behavior of Cr-Mo high-strength steel （SCM440） used as fasteners for Wind Turbine System. 　　The results showed that dynamic racrystallization phenomenon was observed under different strain rates （0.1s-1、1s-1、10s-1） and temperatures （600oC-1200oC）. On the basis of engineering stress-strain curves, the Zener-Hollomon and Hyperbolic sine law equations were used to determine the activation energy (Q). It was found that the activation energy was 294,641J/mol at peak flow stress and further obtained the flow stress (σp) constitutive equation to predict the peak stress of SCM440. The results showed that the mean error (%) was 4.6% between predicted and measured peak flow stress. It indicated that the constitutive equation was successfully applied to predict the peak stress of SCM440 under hot forging. Simultaneously, according to the method of Poliak and Jonas, this study also predicted the critical state of dynamic recrystallization and the critical stress of dynamic recrystallization were fitted with the value of lnZ. 　　Moreover, on the basis of microstructure evolution during hot compression, this study distinguished between full and partial dynamic recrystallization by the value of lnZ. The microstructure had been induced full dynamic recrystallization when the value of lnZ was less than 23.28. On the other hand, the microstructure had been induced partial dynamic recrystallization when the value of lnZ was bigger than 25.26. Finally, this study also investigated the microstructure evolution under different strain and cooling rates. Under the premise that the hardness was not decreased, the microstructure obtained 2~3μm ferrite under strain rate 1s-1 during different cooling rates (5oC/s、10oC/s、20oC/s) upon Ae3 temperature and obtained 2~6μm ferrite under strain rates (0.1s-1、1s-1) during different cooling rates (5oC/s、10oC/s、20oC/s) upon Bs temperature. Furthermore, it was found the different degree of static recrystallization had been induced during different cooling rates (5oC/s、10oC/s、20oC/s) under strain rate 1s-1.
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WANG, YU-CHUNG, and 王昱中. "The Effect on Anaerobic Threshold and Heart Rate Variability of Acute One-Day High-Intensity-Interval Training with Cooling and Hyperoxia." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/683yg6.

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碩士
國立體育大學
競技與教練科學研究所
106
Purpose: The am of the research is to investigate the effects of acute one-day high-intenstity-interval training (HIIT) with cooling and hyperorxia application recovery applications on Anaerobic Threshold and Heart rate Variablity. Methods: Eight healthy male participants (25.5±3.3 yr、173±7.5 cm、75±12.1 kg) completed two HIIT session with cooling (-120〜140°C Cryochamber) or hyperoxia (80% O2) application in different day. Before and after the HIIT, incremental running test was applied to evaluate the endurance performance of subjects.Capillary blood lactate (La), heart rate (HR), blood ammonia (NH3), were measured during HIIT training and incremental running test. Paired-t test was used to analysis parameters. The statistical significance was set as α = .05. Results: The aerobic threshold speed became higher after both recovery applications (cooling: +0.4 m/s, hyperoxia: +0.1 m/s, p > .05). Anaerobic threshold only increased after hyperoxia application (p > .05). In psot test, blood lactate concentration showed lower at low speed (2.5 m/s, 3.0 m/s, 3.5m/s, p > .05) and high at high speed (4.0 m/s, 4.5 m/s, 5.0 m/s, p > .05). After HIIT, blood lactate concentration was lower with hyperoxia application during the recovery period (p > .05). Heart rate showed significantly lower with hyperoxia than with cooling application at 3rd and 6th minutes during the recovery period (p < .05). Blood ammonia cleanreance was -0.5 µmol/l with cooling and -26 µmol/l with hyperocia (p<.05). Conclusion: One-day HIIT with cooling and hyperoxia showed no significant improvement in both aerobic and anerobic threshold. After HIIT, hyperoxia showed better recovery in heart rate (p < .05) and blood ammonia (p < .05).
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Badakhshan, Raz Sadegh. "A Study of Formation and Dissociation of Gas Hydrate." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10976.

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The estimation of gas hydrate volume in closed systems such as pipelines during shut-in time has a great industrial importance. A method is presented to estimate the volume of formed or decomposed gas hydrate in closed systems. The method was used to estimate the volume of formed gas hydrate in a gas hydrate crystallizer under different subcoolings of 0.2, 0.3, 0.6 and 4.6 degrees C, and initial pressures of 2000 and 2500 psi. The rate of gas hydrate formation increased with increases in subcooling and initial pressure. The aim of the second part of the study was the evaluation of the formation of gas hydrate and ice phases in a super-cooled methane-water system under the cooling rates of 0.45 and 0.6 degrees C/min, and the initial pressures of 1500, 2000 and 2500 psi, in pure and standard sea water-methane gas systems. The high cooling rate conditions are likely to be present in pipelines or around a wellbore producing from gas hydrate reservoir. Results showed that the initial pressure and the chemical composition of the water had little effect on the ice and gas hydrate formation temperatures, which were in the range of -8 +/- 0.2 degrees C in all the tests using the cooling rate of 0.45 degrees C/min. In contrast, the increase in the cooling rate from 0.45 to 0.6 degrees C/min decreased the ice and gas hydrate formation temperatures from -8 degrees C to -9 degrees C. In all tests, ice formed immediately after the formation of gas hydrate with a time lag less than 2 seconds. Finally, an analytical solution was derived for estimating induced radial and tangential stresses around a wellbore in a gas hydrate reservoir during gas production. Gas production rates between 0.04 to 0.12 Kg of gas per second and production times between 0.33 to 8 years were considered. Increases in production time and production rate induced greater radial and tangential stresses around the wellbore.
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Books on the topic "High cooling rate"

1

Schra, L. Effect of cooling rate on corrosion properties of high strength aluminium alloys under atmospheric conditions. Amsterdam: National Aerospace Laboratory, 1990.

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2

Menzel, W. Paul. Determination of atmospheric moisture structure and infrared cooling rates from high resolution MAMS radiance data: Final report on NASA contract NAS8-36169 for the period of 7 November 1986 to 18 September 1991. Madison, Wis: Cooperative Institute for Meteorological Satellite Studies (CIMSS), University of Wisconsin, 1991.

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C, Moeller Christopher, Smith William L, Cooperative Institute for Meteorological Satellite Studies (Madison, Wis.), and United States. National Aeronautics and Space Administration., eds. Determination of atmospheric moisture structure and infrared cooling rates from high resolution MAMS radiance data: Final report on NASA contract NAS8-36169 for the period of 7 November 1986 to 18 September 1991. Madison, Wis: Cooperative Institute for Meteorological Satellite Studies (CIMSS), University of Wisconsin, 1991.

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Book chapters on the topic "High cooling rate"

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Peter, Johannes M. F., and Markus J. Kloker. "Numerical Simulation of Film Cooling in Supersonic Flow." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 79–95. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_5.

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Abstract High-order direct numerical simulations of film cooling by tangentially blowing cool helium at supersonic speeds into a hot turbulent boundary-layer flow of steam (gaseous H2O) at a free stream Mach number of 3.3 are presented. The stagnation temperature of the hot gas is much larger than that of the coolant flow, which is injected from a vertical slot of height s in a backward-facing step. The influence of the coolant mass flow rate is investigated by varying the blowing ratio F or the injection height s at kept cooling-gas temperature and Mach number. A variation of the coolant Mach number shows no significant influence. In the canonical baseline cases all walls are treated as adiabatic, and the investigation of a strongly cooled wall up to the blowing position, resembling regenerative wall cooling present in a rocket engine, shows a strong influence on the flow field. No significant influence of the lip thickness on the cooling performance is found. Cooling correlations are examined, and a cooling-effectiveness comparison between tangential and wall-normal blowing is performed.
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Taniguchi, Shigeji, Yuki Hanamoto, and Junji Nakata. "Influence of Cooling Rate and Steel Composition on the Scale Failure Characteristics during Cooling of Si-Containing Low Carbon Steels." In High-Temperature Oxidation and Corrosion 2005, 505–12. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-409-x.505.

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Gonçalves, Cristiane Sales, André Luiz Slaviero, Rafael Agnelli Mesquita, André Paulo Tschiptschin, and Paulo de Tarso Haddad. "Effect of Cooling Rate During Quenching on the Toughness of High Speed Steels." In 18th International Federation for Heat Treatment and Surface Engineering, 484–96. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2011. http://dx.doi.org/10.1520/stp49452t.

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Gonçalves, Cristiane Sales, André Luiz Slaviero, Rafael Agnelli Mesquita, André Paulo Tschiptschin, and Paulo de Tarso Haddad. "Effect of Cooling Rate During Quenching on the Toughness of High Speed Steels." In 18th International Federation for Heat Treatment and Surface Engineering, 484–96. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2011. http://dx.doi.org/10.1520/stp153220120034.

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Gällström, Andreas, Bjorn Magnusson, P. Carlsson, N. T. Son, Anne Henry, Franziska C. Beyer, Mikael Syväjärvi, Rositza Yakimova, and Erik Janzén. "Influence of Cooling Rate after High Temperature Annealing on Deep Levels in High-Purity Semi-Insulating 4H-SiC." In Materials Science Forum, 371–74. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-442-1.371.

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Ye, Qibin, Zhenyu Liu, and Guodong Wang. "Effect of Cooling Rate on Microstructure and Centerline Segregation of A High-Strength Steel for Shipbuilding." In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 365–70. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119223399.ch41.

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Ye, Qibin, Zhenyu Liu, and Guodong Wang. "Effect of Cooling Rate on Microstructure and Centerline Segregation of a High-Strength Steel for Shipbuilding." In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 365–70. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48767-0_41.

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Dugic, Izudin. "Effect of Molybdenum Content, Pouring Temperature and Cooling Rate on the Casting Defects of High Chromium White Cast Iron." In TMS 2017 146th Annual Meeting & Exhibition Supplemental Proceedings, 475–82. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51493-2_45.

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Cho, Jae-Ik, Cheol-Woo Kim, Young-Chan Kim, Se-Weon Choi, and Chang-Seog Kang. "The Relationship between Dendrite Arm Spacing and Cooling Rate of Al-Si Casting Alloys in High Pressure Die Casting." In ICAA13 Pittsburgh, 1493–98. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48761-8_226.

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Zhu, Wenfeng, Guoliang Wang, Chun Xu, and Xiaojuan Li. "Effect of Cooling Rate on Microstructure Evolution of Hot Forming High Strength Steel Based on Non-Isothermal Constitutive Model." In Lecture Notes in Electrical Engineering, 775–96. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8506-2_52.

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Conference papers on the topic "High cooling rate"

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Xie, Xiaoyi, Hongji Qi, and Jianda Shao. "DKDP crystal growth controlled by cooling rate." In Pacific Rim Laser Damage 2017: Optical Materials for High Power Lasers, edited by Jianda Shao, Takahisa Jitsuno, and Wolfgang Rudolph. SPIE, 2017. http://dx.doi.org/10.1117/12.2269743.

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Huang, Tingrui, Wenfa Huang, Jiangfeng Wang, Xinghua Lu, Wei Fan, and Xuechun Li. "Sapphire face cooling for high-repetition-rate terawatt-class Ti:sapphire amplifier." In Sixth International Conference on Optical and Photonic Engineering, edited by Yingjie Yu, Chao Zuo, and Kemao Qian. SPIE, 2018. http://dx.doi.org/10.1117/12.2326819.

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Piotrowicz, Michał J., Thomas G. Akin, John Reintjes, Alex Kuzmich, Adam T. Black, and Mark Bashkansky. "Optimized Cooling of Atoms in Optical Lattice for High Rate Quantum Memory Operation." In Frontiers in Optics. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/fio.2018.jw4a.61.

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Gu, Liyu, Lin Qu, Haitao Ma, Zhongbing Luo, and Lai Wang. "Effects of soldering temperature and cooling rate on the as-soldered microstructures of intermetallic compounds in Sn-Ag/Cu joint." In High Density Packaging (ICEPT-HDP). IEEE, 2011. http://dx.doi.org/10.1109/icept.2011.6066848.

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Shigemitsu, Toru, Junichiro Fukutomi, and Takuya Agawa. "Performance Characteristics and Flow Conditions of High Pressure and Large Flow Rate Cooling Fan." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16273.

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Data center has been built with spread of cloud computing. Further, electric power consumption of it is growing rapidly. High pressure and large flow rates small-sized cooling fans are used for servers in the data center and there is a strong demand to increase pressure and flow rate of it because of increase of quantity of heat from the servers. Contra-rotating rotors have been adopted for some of the high pressure and large flow rate cooling fans to meet the demand of it. There is limitation of space for servers and geometrical restriction for cooling fan because spokes to support the fan motor, electrical power cables and so on should be installed in the cooling fan. It is important to clarify performance of each front and rear rotor of contra-rotating small-sized cooling fan and internal flow condition to achieve the high performance cooling fans. In the present paper, detailed performance and the flow condition around the rotor of the high pressure and large flow rate contra-rotating small-sized axial fan with 40mm square casing are investigated. Pressure, shaft power and efficiency curves of each front and rear rotor are clarified by the experimental and the numerical results. Furthermore, the internal flow condition of the rear rotor is clarified by the numerical analysis results and design guideline to improve the performance is discussed by these results.
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Wei, Guoqiang, and Lei Wang. "Effects of cooling rate on microstructure and microhardness of lead-free Sn-3.0Ag-0.5Cu solder." In 2012 13th International Conference on Electronic Packaging Technology & High Density Packaging (ICEPT-HDP). IEEE, 2012. http://dx.doi.org/10.1109/icept-hdp.2012.6474657.

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Pulugundla, Gautam, Prahit Dubey, Zenan Wu, Qian Wang, and A. K. Srouji. "Thermal Management of Lithium Ion Cells at High Discharge Rate using Submerged-Cell Cooling." In 2020 IEEE Transportation Electrification Conference & Expo (ITEC). IEEE, 2020. http://dx.doi.org/10.1109/itec48692.2020.9161516.

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Dannhauer, Axel. "Investigation of Trailing Edge Cooling Concepts in a High Pressure Turbine Cascade: Analysis of the Adiabatic Film Cooling Effectiveness." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59343.

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Within a European research project experimental studies were performed concerning the determination of the film cooling efficiency on the pressure side of trailing edges of high pressure turbine blades. The experiments were carried out at the linear cascade wind tunnel (EGG) of the German Aerospace Center (DLR), Go¨ttingen. The thermodynamic investigations were performed using the same cascade geometries and trailing edge configurations as for the aerodynamic measurements. Two different trailing edge geometries with coolant ejection were investigated. The first configuration was equipped with a pressure side cutback while for the second configuration the pressure side film cooling was realized by a row of cylindrical holes. The determination of the surface temperatures was done by using a combination of IR-thermography and thermocouples. Preliminary studies showed the feasibility to use metallic surfaces of the suction side of the adjacent blade as a mirror for IR-thermography. Thus it is possible to observe the pressure side near the trailing edge of interest by means of an infrared camera. The camera was mounted outside of the cascade’s free stream ensuring no influence to the aerodynamic boundary conditions. Up to seven flush mounted thermocouples on each side of the trailing edge were used for an in-situ calibration of the infrared pictures and thermal loss calculations. The distributions and averaged values of the film cooling efficiency are in agreement with aerodynamic measurements [9]. The results for the cutback configuration with 0.5% mass flow rate ejected show an accumulation of coolant just behind the coolant slot which is caused by a vortex in the dead region of the cutback. In case of 1.0% mass flow rate a refilling of this region with coolant is indicated. For higher mass flow rates the distributions of the film cooling efficiency looses it’s homogeneity due to flow separations on some ribs of the pin fin array inside of the slot. For the configuration with pressure side bleeding the best coverage could be obtained applying 1.0% mass flow rate.
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Zhang, Shanshan, Qiaoling Wu, Shiquan Heng, and Guorui Tang. "Analysis and Countermeasure of High Deposition Rate of Boiler Water Cooling Wall of 300MW Subcritical Unit." In 2020 3rd International Conference on Advanced Electronic Materials, Computers and Software Engineering (AEMCSE). IEEE, 2020. http://dx.doi.org/10.1109/aemcse50948.2020.00148.

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Xiang, Dong, Eileen Harkin-Jones, and David Linton. "Effect of cooling rate on the properties of high density polyethylene/multi-walled carbon nanotube composites." In PROCEEDINGS OF PPS-30: The 30th International Conference of the Polymer Processing Society – Conference Papers. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4918440.

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