Relevant bibliographies by topics / Supercritical pressures

Contents

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

Academic literature on the topic 'Supercritical pressures'

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

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Journal articles on the topic "Supercritical pressures"

1

Wang, Ning, and Yu Pan. "Correlation for heat transfer of RP-3 kerosene flowing in miniature tube at supercritical pressures." Modern Physics Letters B 34, no. 12 (2020): 2050116. http://dx.doi.org/10.1142/s021798492050116x.

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Experimental investigations on heat transfer of RP-3 kerosene at supercritical pressures are conducted in this paper. It is found that there are three regimes, namely common heat transfer, enhanced heat transfer and deteriorated heat transfer. Variations of thermal properties are responsible for common heat transfer. Turbulence is the main reason for enhanced heat transfer. Cracking reactions are attributed to deteriorated heat transfer. Parametric studies show that heat flux has little effects on heat transfer of RP-3 at supercritical pressures while mass flow rate plays a positive role. Influence of pressure is complicated, related to thermal property variations. A new correlation for heat transfer of RP-3 flowing in miniature tube at supercritical pressure is proposed.
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Tao, Yong Qing, Yang Shi, Si Min Zhang, et al. "One-Step Effective Segregation of Ginger Essential Oil and Gingerol in Oleoresin Ginger via Transcritical CO2." Advanced Materials Research 699 (May 2013): 207–11. http://dx.doi.org/10.4028/www.scientific.net/amr.699.207.

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We developed a supercritical CO2 extraction procession and determinated ginger essential oil contents from the ginger oleoresin to explore the effects of temperatures or pressures on the supercritical CO2 extraction. Our research indicated that pressures had little effect on the liquid CO2 extraction capacity. However, supercritical CO2 extraction capacity was affected dramatically by the variant pressures. Additionally, changing pressures or temperature pushed the CO2 into transcritical isolation state. Under this circumstance, we not only ensured the yield of ginger oleoresin, but also did we obtain the ginger essential oil and gingerol simultaneously.
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Cai, Hailiang, Peichao Li, Zhixin Ge, Yuxi Xian, and Detang Lu. "A new method to determine varying adsorbed density based on Gibbs isotherm of supercritical gas adsorption." Adsorption Science & Technology 36, no. 9-10 (2018): 1687–99. http://dx.doi.org/10.1177/0263617418802665.

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In the calculation of the absolute adsorption of supercritical gas adsorbed on the microporous materials, most existing methods regard the adsorbed density as a constant, which is very unreasonable. In this study, an extended pressure point method combined with Langmuir adsorption model is proposed in which the varying adsorbed density under different pressures is considered at the same time. The utility of the proposed method to correlate accurately the experimental data for supercritical gas adsorption system is demonstrated by high-pressure methane adsorption measurements on two groups of shale samples. Taking advantage of the proposed method, we can obtain the adsorbed density and the adsorbed volume corresponding to different pressures. Compared with the conventional methods under the assumption of fixed and parameterized adsorbed density, the proposed method yields better fitting results with the experimental data. Our work should provide important fundamental understandings and insights into the supercritical gas adsorption system.
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Sumanatrakul, Panita, Chayanoot Sangwichien, Gregory Aranovich, and Marc D. Donohue. "Adsorption Compression Analysis for Supercritical Fluids using Ono-Kondo Model." ASEAN Journal of Chemical Engineering 11, no. 2 (2012): 45. http://dx.doi.org/10.22146/ajche.50062.

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In this paper, supercritical data has been evaluated and shown to demonstrate adsorption compression. Ono-Kondo analysis of adsorption isotherms for supercritical systems (including nitrogen, methane, and carbon dioxide on activated carbon Filtrasorb 400 and on zeolite 13X) indicates adsorption compression phenomenon at high pressure end just as in subcritical systems. Experimental isotherms for adsorption of supercritical fluids are plotted in Ono-Kondo coordinates with the Henry’s constant estimated based on results of modeling as well as calorimetric and chromatographic measurements. The linear sections of the results show the range of applicability of the classical Ono-Kondo model with constant energies of interactions. The slopes of these linear sections represent values and signs of these energies: negative slopes indicate repulsive interactions in adsorbed phase due to adsorption compression. Switching interactions from attractive to repulsive with an increase in the pressure for supercritical adsorption suggests that adsorbed phase has two regions. One is an attractive region at low-pressures and the other is a repulsive region at high pressures. It can be indicated that the shape of isotherms in Ono-Kondo coordinates can help to understand adsorbate-adsorbate energies; the slope of the line in Ono-Kondo coordinates gives the sign and magnitude of the energy as a function of adsorbate density.
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Song, Yukun, Zhaolei Zheng, Tao Peng, Zhanfeng Yang, Weidong Xiong, and Yiqiang Pei. "Numerical Investigation of the Combustion Characteristics of an Internal Combustion Engine with Subcritical and Supercritical Fuel." Applied Sciences 10, no. 3 (2020): 862. http://dx.doi.org/10.3390/app10030862.

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The similarities and differences in the combustion and emission characteristics of supercritical- and subcritical-state fuel injection conditions of an internal combustion engine was clarified. The effects of fuel state on temperature, pressure, turbulent kinetic energy, heat release rate, NO, and soot in the cylinder during the operation of the internal combustion engine were simulated. Ignition occurred faster, and the peak temperature in the cylinder was achieved in shorter time under the supercritical-state fuel injection condition than under the subcritical condition. The cylinder pressures in both states peaked at the same time, but the value of pressure in the supercritical fuel state was larger than that in the subcritical state. Furthermore, the turbulence in the supercritical fuel state was more intense than that in the subcritical state. The intense turbulence was beneficial to fuel and air mixing. NO emission increased, and soot emission decreased in the supercritical fuel state. The results show that supercritical fuel can be fully mixed with air to reduce the local concentration area in the cylinder, improve the combustion performance of the engine, and greatly reduce pollutant emissions.
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Dahms, Rainer N., and Joseph C. Oefelein. "Liquid jet breakup regimes at supercritical pressures." Combustion and Flame 162, no. 10 (2015): 3648–57. http://dx.doi.org/10.1016/j.combustflame.2015.07.004.

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HEZAVE, ALI ZEINOLABEDINI, and MOSTAFA LASHKARBOLOOKI. "A NEW SIMPLE CORRELATION FOR CALCULATING SOLUBILITY OF DRUGS IN SUPERCRITICAL CARBON DIOXIDE." Journal of Theoretical and Computational Chemistry 12, no. 07 (2013): 1350062. http://dx.doi.org/10.1142/s0219633613500624.

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During the past 20 years, supercritical fluid (SCF) based technologies have been gaining an increasing attention through the academic and industrial communities due to its advantages. One of the most important parameter for any supercritical-based technologies is the knowledge of the solute solubility at different pressures and temperatures. But, due to several concerns e.g. time and expense, measuring the solubility of all compounds in wide ranges of temperature and pressure is not possible. Respect to this, a new empirical correlation with four fitting parameters has been proposed to correlate the solubility of pharmaceuticals in different temperatures and pressures. The obtained results compared with four widely used density based correlations including Mendez-Santiago and Teja (MST), Bartle et al., Chrastil, Kumar and Johnston (KJ) revealed rather good capability of the proposed simple correlation for predicting the solubility of solutes in supercritical carbon dioxide (SC- CO 2). At last, the obtained results compared with the results of three Equations of State (EoS's) with three different mixing rules.
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Wang, Fangzhi, and Axel Meisen. "Canola paste extrusion for feeding supercritical extractors." Canadian Journal of Physics 73, no. 5-6 (1995): 304–9. http://dx.doi.org/10.1139/p95-042.

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A custom-built, single-screw extruder (barrelf 0.44 m long, 36.75 mm ID; screw flight angles: 5.98°, 7.97°; or 9.94°; average screw flight: 4.9 mm high, 3 mm wide; flight-top to barrel clearance: 0.0254 mm) was developed for continuously feeding precrushed Canola seed pastes into supercritical fluid extractors. The screw was driven by two variable-speed hydraulic motors and rotated typically at 66.5, 88.5, or 100.5 rpm. The pressures and temperatures along the extruder barrel were measured with six iron–Constantan thermocouples and four pressure transducers, respectively. The discharge rate of the paste was determined gravimetrically and was found to vary from approximately 1.7 to 9.5 kg h−1 for average discharge pressures ranging from 30 to 10 MPa. The average pressure along the barrel was found to increase almost linearly. A three-component velocity model was developed to simulate the extruder performance and verified by comparison with experimental data obtained by using a Newtonian fluid having a viscosity of 130 Pa s. The model over predicted the discharge rates of Canola pastes unless allowance is made for slip. The practical implications for supercritical extraction processes are discussed.
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Banuti, Daniel. "The Latent Heat of Supercritical Fluids." Periodica Polytechnica Chemical Engineering 63, no. 2 (2019): 270–75. http://dx.doi.org/10.3311/ppch.12871.

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The article discusses the notion of a supercritical latent heat during 'pseudoboiling': Experimental, numerical, and theoretical evidence show that the supercritical state space is not homogeneous, but can be divided into liquid-like and gas-like domains, separated by an extension to the coexistence line -- the Widom line. The key concept are two limit states of ideal liquid and ideal gas, characterized by constant heat capacities, and analyze the transition between them. Then, analogous to subcritical vaporization, a supercritical state transition from liquid to gaseous overcomes intermolecular attractive forces, albeit over a finite temperature interval rather than at an equilibrium temperature. This distributed latent heat is in fact approximately invariant with respect to pressure for (0 < p < 3 pcr) and is thus valid at subcritical and supercritical conditions. This view also changes the perspective on subcritical latent heat: while it is an accurate representation of the required energy at very low pressures, the contribution of the distributed latent heat dominates the equilibrium latent heat as the critical pressure is approached.
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Yan, Jianguo, Shouchun Liu, Pengcheng Guo, and Qincheng Bi. "Experiments on Heat Transfer of Supercritical Pressure Kerosene in Mini Tube under Ultra-High Heat Fluxes." Energies 13, no. 5 (2020): 1229. http://dx.doi.org/10.3390/en13051229.

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Heat transfer of supercritical-pressure kerosene is crucial for regenerative cooling systems in rocket engines. In this study, experiments were devoted to measure the heat transfer of supercritical-pressure kerosene under ultra-high heat fluxes. The kerosene flowed horizontally in a mini circular tube with a 1.0 mm inner diameter and was heated uniformly under pressures of 10–25 MPa, mass fluxes of 8600–51,600 kg/m2 s, and a maximum heat flux of up to 33.6 MW/m2. The effects of the operating parameters on the heat transfer of supercritical-pressure kerosene were discussed. It was observed that the heat transfer coefficient of kerosene increases at a higher mass flux and inlet bulk temperature, but is little affected by pressure. The heat transfer of supercritical-pressure kerosene is classified into two regions: normal heat transfer and enhanced heat transfer. When the wall temperature exceeds a certain value, heat transfer is enhanced, which could be attributed to pseudo boiling. This phenomenon is more likely to occur under higher heat flux and lower mass flux conditions. In addition, the experimental data were compared with several existing heat transfer correlations, in which one of these correlations can relatively well predict the heat transfer of supercritical-pressure kerosene. The results drawn from this study could be beneficial to the regenerative cooling technology for rocket engines.
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Dissertations / Theses on the topic "Supercritical pressures"

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Kline, Nathan. "An Experimental Study of Heat Transfer Deterioration at Supercritical Pressures." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36195.

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Convective heat transfer to CO2 flowing upward in electrically heated vertical tubes at supercritical pressures was studied for wall heat fluxes q within ranges that included values corresponding to the onset of heat transfer deterioration (HTD). The inlet pressure was P = 8.35 MPa, the mass flux was in the range 200 kg/m2s ≤ G ≤ 1500 kg/m2s, and the inlet temperature was in the range 0 ◦C ≤ Tin ≤ 35 ◦C. Wall temperature measurements were collected in three tubular test sections, having inner diameters of D = 4.6, 8, and 22 mm. The abilities of three different HTD identification methods to separate the entire data set into deteriorated and normal heat transfer modes were tested. Two types of buoyancy parameters were tested as HTD detection methods, and correction factors for changes in mass flux were devised. The minimum heat flux at HTD onset was found to follow a power law of mass flux with the same exponent for all three sections and the same proportionality coefficient for the two smaller sections but a smaller one for the larger test section. For heat flux values that were larger than this minimum, HTD was found to occur only within a limited range of Tin, whose width increased with increasing heat flux. The heat transfer coefficient for normal heat transfer was expressed as an exponential function of the diameter.
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Mitra, Biswajit. "Supercritical gas cooling and condensation of refrigerant R410A at near-critical pressures." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-06142005-232427/.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2006.
Garimella, Srinivas, Committee Chair ; Ghiaasiaan, S. Mostafa, Committee Member ; Graham, Samuel, Committee Member ; Breedveld, Victor, Committee Member ; Fuller,Tom, Committee Member.
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Okamura, Takahiro. "Forced convection heat transfer of He 1 and He 2 up to supercritical pressures." Kyoto University, 2004. http://hdl.handle.net/2433/145258.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(エネルギー科学)
甲第11206号
エネ博第103号
新制||エネ||28(附属図書館)
22790
UT51-2004-T175
京都大学大学院エネルギー科学研究科エネルギー応用科学専攻
(主査)教授 塩津 正博, 教授 宅田 裕彦, 助教授 白井 康之
学位規則第4条第1項該当
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Eter, Ahmad. "Flow Obstruction Effects on Heat Transfer in Channels at Supercritical and High Subcritical Pressures." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35574.

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The objective of this thesis research is to improve our understanding of the flow obstacle effect on heat transfer at supercritical and high subcritical pressures by experimentally studying the effect of different obstacles on heat transfer in two vertical upward-flow test sections: a 3-rod bundle and an 8 mm ID tube. The heat transfer measurements cover the region of interest of the Canadian Super-critical Water Cooled Reactor (SCWR). A thorough analysis of the obstacle effect on supercritical heat transfer (SCHT) was performed. In the 3-rod bundle, two types of obstacles were employed: wire wraps and low-impact grid spacers. Wire wraps were found to be more effective than grid spacers to enhance the SCHT. In the tubular test section, obstacles appeared to suppress the heat transfer deterioration (HTD) or decrease its severity; obstacles also generally enhanced the SCHT both in the liquid-like and the gas- like region. The experiment in the tubular test section revealed that, at certain flow conditions (low mass flux, low inlet subcooling), flow obstacles can have an adverse impact on the SCHT. A criterion to predict the onset of this adverse effect was developed. At high subcritical pressures, obstacles increased the CHF and reduced the maximum post-CHF temperature. A comparison of the experimental data with prediction methods for the SCHT, single phase heat transfer, CHF and post-dryout heat transfer was performed. Lastly, a new correlation to predict the enhancement in SCHT due to obstacles was developed for heat transfer in the liquid-like and gas-like regions.
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Knaust, Stefan. "Microsystems for Harsh Environments." Doctoral thesis, Uppsala universitet, Mikrosystemteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-253558.

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When operating microsystems in harsh environments, many conventionally used techniques are limiting. Further, depending on if the demands arise from the environment or the conditions inside the system, different approaches have to be used. This thesis deals with the challenges encountered when microsystems are used at high pressures and high temperatures. For microsystems operating at harsh conditions, many parameters will vary extensively with both temperature and pressure, and to maintain control, these variations needs to be well understood. Covered within this thesis is the to-date strongest membrane micropump, demonstrated to pump against back-pressures up to 13 MPa, and a gas-tight high pressure valve that manages pressures beyond 20 MPa. With the ability to manipulate fluids at high pressures in microsystems at elevated temperatures, opportunities are created to use green solvents like supercritical fluids like CO2. To allow for a reliable and predictable operation in systems using more than one fluid, the behavior of the multiphase flow needs to be controlled. Therefore, the effect of varying temperature and pressure, as well as flow conditions were investigated for multiphase flows of CO2 and H2O around and above the critical point of CO2. Also, the influence of channel surface and geometry was investigated. Although supercritical CO2 only requires moderate temperatures, other supercritical fluids or reactions require much higher temperatures. The study how increasing temperature affects a system, a high-temperature testbed inside an electron microscope was created. One of the challenges for high-temperature systems is the interface towards room temperature components. To circumvent the need of wires, high temperature wireless systems were studied together with a wireless pressure sensing system operating at temperatures up to 1,000 °C for pressures up to 0.3 MPa. To further extend the capabilities of microsystems and combine high temperatures and high pressures, it is necessary to consider that the requirements differs fundamentally. Therefore, combining high pressures and high temperatures in microsystems results in great challenges, which requires trade-offs and compromises. Here, steel and HTCC based microsystems may prove interesting alternatives for future high performance microsystems.
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Jennings, David Wayne. "High pressure phase equilibria and supercritical fluid extraction involving carbon dioxide systems." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/11239.

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Ogden, Sam. "High-Pressure Microfluidics." Doctoral thesis, Uppsala universitet, Mikrosystemteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-208915.

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In this thesis, some fundamentals and possible applications of high-pressure microfluidics have been explored. Furthermore, handling fluids at high pressures has been addressed, specifically by creating and characterizing strong microvalves and pumps. A variety of microstructuring techniques was used to realize these microfluidic devices, e.g., etching, lithography, and bonding. To be able to handle high pressures, the valves and pumps need to be strong. This necessitates a strong actuator material. In this thesis, the material of choice is paraffin wax. A new way of latching paraffin-actuated microvalves into either closed or open position has been developed, using the low thermal conductivity of paraffin to create large thermal gradients within a microactuator. This allows for long open and closed times without power consumption. In addition, three types of paraffin-actuated pumps are presented: A peristaltic high-pressure pump with integrated temperature control, a microdispensing pump with high repeatability, and a pump system with two pumps working with an offset to reduce flow irregularities. Furthermore, the fundamental behavior of paraffin as a microactuator material has been explored by finite element modeling. One possibility that arises with high-pressure microfluidics, is the utilization of supercritical fluids for different applications. The unique combination of material properties found in supercritical fluids yields them interesting applications in, e.g., extraction and cleaning. In an attempt to understand the microfluidic behavior of supercritical carbon dioxide, the two-phase flow, with liquid water as the second phase, in a microchannel has been studied and mapped with respect to both flow regime and droplet behavior at a bi-furcating outlet.
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Suleiman, Norhidayah. "High pressure phase equilibria applications involving supercritical fluids." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/35580/.

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This thesis describes the investigation of phase behaviour of binary and ternary mixtures at high pressure. The particular applications chosen to be explored in this phase behaviour investigation were supercritical fluid electrodeposition (SCFED) and carbon capture and storage (CCS). Chapter 1 introduces the phase behaviour of mixtures. Chapter 2 describes the equipment and analytical techniques used throughout this thesis including the high-pressure variable-volume view cell, electrical conductivity cell, high pressure FTIR cell, and high-pressure optical fiber phase analyser. Chapter 3 details the solubility and conductivity investigation of several supporting electrolytes in difluoromethane (CH2F2), which provided an electrochemical bath with sufficient conductivity for electrodeposition in supercritical fluids. The most effective supporting electrolyte amongst the eight ionic compounds tested was [N(nC4H9)4][Al(OC(CF3)3)4] which was found to give a moderate solubility and the highest conductivity (222 Scm2mol-1) in CH2F2. [N(nC4H9)4][Al(OC(CF3)3)4] was followed by [N(nC4H9)4][FAP] and [N(nCH3)4][FAP], , making all of them to be satisfactory potential supporting electrolytes for SCFED. Chapter 4 describes the investigation of water solubility in CO2/N2 mixtures relevant to the CCS process. The scope of the investigation covers a wide pressure range and two levels of N2 (xN2= 0.05 and xN2= 0.10). This experimental study was conducted by using the FTIR technique as described in further detail in Chapter 2. It was found that the presence of N2 in CO2 lowered the solubility of H2O in supercritical CO2 with N2 compared to pure CO2. The solubility of water also decreases significantly when the concentration of N2 is increased from 5% to 10%. Chapter 5 further explores the role of phase behaviour in the application of CCS with the investigation of the phase envelope of the ternary mixtures of CO2 and permanent gases (Ar, N2, and H2). Three ternary mixtures were measured (90% CO2 + 5% N2 + 5% Ar, 98% CO2 + 1% N2 + 1% Ar, and 95% CO2 + 3% H2 + 2% Ar) by using the fiber optic reflectometer, as described in further detail in Chapter 2. The experimental data presented in this part also have been used to validate the equation of state for the CCS applications. It was found that the phase envelope of CO2 shifted to a higher pressure and the two-phase region become broader with the presence of permanent gases. Overall, both GERG-2004 and gSAFT provide a good agreement between the predicted and experimental data for all the ternary mixtures investigated, with the exception of the bubble-point line for the 3%H2 + 2%Ar + 95% CO2 mixture. Finally, Chapter 6 summarises the research that was conducted in this thesis. It also evaluates the progress made towards achieving the aims initially set-up in Chapter 1.
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Johnson, Thomas G. "Heat Transfer in Brine Solutions at Supercritical Pressure." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1439504843.

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McCullagh, M. A. "Studies of supercritical fluid chromatography atmospheric pressure ionisation mass spectrometry." Thesis, Swansea University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638152.

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The advantages of packed column supercritical fluid chromatography (SFC) over LC in terms of speed of analysis, increased efficiency and speed of method development have been shown to be of particular use for chiral separations of β-Blockers, where UV detection was employed. Interfaces that enabled SFC-MS to be effected were initially reviewed to enable the development of an interface to couple an HP G1205 A supercritical fluid chromatograph to the APCI source of the Finnigan TSQ 700 and LCQ ion trap. Effectively, SFC-MS has been effected with a pre-expansion split and a post-expansion interface thus allowing a portion of the eluent to enter the ionisation region of the mass spectrometer from the supercritical fluid chromatograph. For the work presented, approximately twenty five per cent of the eluent entered the ionisation source. Later, SFC was coupled with the ES ionisation source of the LCQ ion trap. The interfaces developed offer enhanced specificity of identification, with improved detection limits over UV and allowed a comparison of effecting SFC-API-MS with the two mass spectrometers. Being able to facilitate SFC-ES-MS and SFC-APCI-MS with an LCQ ion trap allowed a comparison of the ionisation techniques for the analytes of interest. The differences in effecting SFC-API-MS-MS with the LCQ ion trap and the SQ 700 were illustrated. Anti cancer agents are of great interest to the pharmaceutical industry. Two of synthetically produced groups of lignans were analysed using SFC-APCI-MSn and SFC-ES-MSn. Acceptable resolution of the enantiomers and low detection limits are shown, thus showing SFC-API-MS to be a potential tool to help solve chiral analysis problems within industry. Investigations in the use of a Shandon hypercarb column to effect packed column SFC-API-MS have also been explored. Packed column SFC-API-MSn is shown for benzodiazepines, sulphonamides and carbamate pesticides. Fast analysis times, acceptable resolution and low detection limits for the three classes of compounds are shown.
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Books on the topic "Supercritical pressures"

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Eckstrom, Clinton V. Flight measurements of surface pressures on a flexible supercritical research wing. Langley Research Center, 1985.

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Pioro, I. L. Heat transfer and hydraulic resistance at supercritical pressures in power engineering applications. ASME Press, 2007.

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Hendricks, Robert C. Two-phase flows and heat transfer within systems with ambient pressure above the thermodynamic critical pressure. National Aeronautics and Space Administration, Lewis Research Center, 1986.

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Hendricks, Robert C. Two-phase flows and heat transfer within systems with ambient pressure above the thermodynamic critical pressure. National Aeronautics and Space Administration, Lewis Research Center, 1986.

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Hendricks, Robert C. Two-phase flows and heat transfer within systems with ambient pressure above the thermodynamic critical pressure. National Aeronautics and Space Administration, Lewis Research Center, 1986.

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Mori, Hideo, and Yoshiaki Oka. Supercritical-pressure light water cooled reactors. Springer, 2014.

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Oka, Yoshiaki, and Hideo Mori, eds. Supercritical-Pressure Light Water Cooled Reactors. Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-55025-9.

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Hunt, Andrew J., and Thomas M. Attard, eds. Supercritical and Other High-pressure Solvent Systems. Royal Society of Chemistry, 2018. http://dx.doi.org/10.1039/9781788013543.

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European High Pressure Research Group. Meeting. High pressure chemistry: Synthetic, mechanistic, and supercritical applications. Wiley-VCH, 2002.

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J, Krukonis Val, ed. Supercritical fluid extraction: Principles and practice. Butterworths, 1986.

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Book chapters on the topic "Supercritical pressures"

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Schneider, Gerhard M. "Physico-Chemical Properties and Phase Equilibria of Pure Fluids and Fluid Mixtures at High Pressures." In Supercritical Fluids. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-015-8295-7_4.

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Matheis, Jan, Hagen Müller, Stefan Hickel, and Michael Pfitzner. "Large-Eddy Simulation of Cryogenic Jet Injection at Supercritical Pressures." In High-Pressure Flows for Propulsion Applications. American Institute of Aeronautics and Astronautics, Inc., 2020. http://dx.doi.org/10.2514/5.9781624105814.0531.0570.

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Franck, E. U. "Combustion and Diffusion Flames in Supercritical Aqueous Fluids at High Pressures." In High Pressure Chemistry, Biochemistry and Materials Science. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1699-2_11.

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Forliti, D. J., I. A. Leyva, D. G. Talley, et al. "Forced and Unforced Shear Coaxial Mixing and Combustion at Subcritical and Supercritical Pressures." In High-Pressure Flows for Propulsion Applications. American Institute of Aeronautics and Astronautics, Inc., 2020. http://dx.doi.org/10.2514/5.9781624105814.0233.0280.

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Kiran, Erdogan, Ke Liu, and Zeynep Bayraktar. "Polymer Solutions at High Pressures: Pressure-Induced Miscibility and Phase Separation in Near-critical and Supercritical Fluids." In Computational Studies, Nanotechnology, and Solution Thermodynamics of Polymer Systems. Springer US, 2002. http://dx.doi.org/10.1007/0-306-47110-8_6.

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Fan, Chengkai, Qi Li, Xiaying Li, Zhiyong Niu, and Liang Xu. "Dynamic Optical Fiber Monitoring of Water-Saturated Sandstone During Supercritical CO2 Injection at Different Sequestration Pressures." In Proceedings of the 8th International Congress on Environmental Geotechnics Volume 3. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2227-3_2.

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Eggers, Rudolf, and Eduard Lack. "Supercritical Processes." In Industrial High Pressure Applications. Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527652655.ch8.

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DeSouza, Shaun, and Corin Segal. "Supercritical Coaxial Jet Disintegration." In High-Pressure Flows for Propulsion Applications. American Institute of Aeronautics and Astronautics, Inc., 2020. http://dx.doi.org/10.2514/5.9781624105814.0157.0182.

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Rzoska, Sylwester J., and Aleksandra Drozd Rzoska. "New Proposals for Supercritical Fluids Applications." In Metastable Systems under Pressure. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3408-3_12.

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Kiran, E. "Polymer Miscibility and Kinetics of Pressure — Induced Phase Separation in Near-Critical and Supercritical Fluids." In Supercritical Fluids. Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-3929-8_6.

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Conference papers on the topic "Supercritical pressures"

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Pioro, Igor. "Heat-Transfer at Supercritical Pressures." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23403.

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The first works devoted to the problem of heat transfer at supercritical pressures started as early as the 1930s. E. Schmidt and his associates investigated free-convection heat transfer to fluids at the near-critical point with the objective of developing a new effective cooling system for turbine blades in jet engines. In the 1950s, the idea of using supercritical “steam”-water appeared to be rather attractive for steam generators / turbines to increase thermal efficiency of fossil-fired power plants. Intensive work on this subject was mainly performed in the former USSR and in the USA in the 1950s–1980s. Therefore, the most investigated flow geometry at supercritical pressures is circular tubes with water as the coolant. Currently, using supercritical “steam” in fossil-fired power plants is the largest industrial application of fluids at supercritical pressures. At the end of the 1950s and the beginning of the 1960s, some studies were conducted to investigate the possibility of using supercritical water as a coolant in nuclear reactors. Several concepts of nuclear reactors were developed. However, this idea was abandoned for almost 30 years, and then regained momentum in the 1990s as a means to improve the performance of water-cooled nuclear reactors. Main objectives of using supercritical water in nuclear reactors are increasing the efficiency of modern nuclear power plants, which is currently 30–35%, to circa 43–50%, and decreasing operational and capital costs by eliminating steam generators, steam separators, steam dryers, etc. Therefore, objectives of the current paper are to assess the work that was performed and to understand specifics of heat transfer at supercritical pressures.
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Chen, Yuzhou, Minfu Zhao, Chunsheng Yang, Keming Bi, Kaiwen Du, and Shuming Zhang. "Critical Flow of Water Under Supercritical Pressures." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22156.

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An experiment on critical flow of water was conducted in two nozzles of 1.41 mm in diameter and 4.35 mm in length with rounded-edge and sharp-edge respectively, covering the ranges of inlet pressure of 22.1–29.1 MPa and inlet temperature of 38–474 °C. More than 200 data points were obtained. The characteristics and the parametric trends were investigated. In the region of near and beyond pseudo-critical temperature the thermal equilibrium is dominant, and the flow rate can be represented by the modified homogeneous equilibrium model reasonably. In the below pseudo-critical region the results exhibit scattered feature as a result of hysteresis effect in the onset of vaporization, characterizing a bifurcation behavior. This effect is more significant in the nozzle with sharp-edge, especially at higher pressure. For the temperature well below the pseudo-critical point the flow is not at critical condition and is represented by the Bernoulli equation.
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Lacaze, Guilhem, and Joseph C. Oefelein. "Modeling High-Density-Gradient Flows at Supercritical Pressures." In 49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference. American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-3717.

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Terashima, Hiroshi, and Mitsuo Koshi. "Characterization of cryogenic nitrogen jet mixings under supercritical pressures." In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-712.

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Kirillov, Pavel L., and Vera A. Grabezhnaya. "Heat Transfer at Supercritical Pressures and the Onset of Deterioration." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89274.

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The comparison of the data on heat transfer at supercritical pressures (SCP) demonstrates that they have a considerable spread, which shows a complex nature of the process and a probable inaccuracy in the methods of data processing caused by a sharp change in thermophysical properties near the pseudocritical point. The recent experimental data at SCP for upward flow of water are compared with some correlations applicable to engineering analysis. The correlations for the onset of heat transfer deterioration against the experimental data were analyzed. The heat transfer deterioration in this data was far from test section inlet The generalization of data on the onset of heat transfer deterioration for various coolants (water, CO2, R12) was proposed.
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Tani, Hiroumi, Susumu Teramoto, and Toshio Nagashima. "Injector Geometry Effects on Cryogenic Coaxial Jets at Supercritical Pressures." In 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-6738.

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Spore, Jay, and Glenn Roth. "Heat Transfer for Supercritical Flow With TRACE." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16753.

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Abstract Flow regimes at water pressures above the critical pressure are characterized as supercritical flow. Supercritical flows have no phase change. The heat transfer from the wall to the fluid is single phase (there is no boiling or condensation). Experimental data indicate that for conditions that involve supercritical single-phase heat transfer, the Dittus-Boelter heat transfer correlation can be in significant error. A pseudo-critical temperature can be defined as a function of pressure for pressures that exceed the supercritical pressure. The pseudo-critical temperature is defined for heat transfer purposes as the temperature at which the specific heat peaks as the pressure is held constant. There is significant variation in fluid properties across the heat transfer boundary layer at temperatures near the pseudo-critical temperature. The large variation in properties is the reason for the failure of the Dittus-Boelter heat transfer correlation. Comparisons to experimental data indicate that the Mokry heat transfer correlation is a significant improvement over the Dittus-Boelter heat transfer correlation for single phase supercritical heat transfer. The Mokry correlation was chosen to be included into TRACE.
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Fu, Jian, Guoqiang Xu, Yongkai Quan, Yanchen Fu, and Bensi Dong. "Numerical Analysis of Heat Transfer Characteristics of Hexamethyldisiloxane (MM) at Supercritical Pressures." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76260.

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Organic Rankine cycle (ORC) is one of the most promising solutions to utilize low-grade thermal energy for the worldwide energy crisis, environment deterioration, and climate change. Organic fluids, commonly with relatively low critical temperature and pressure, can be heated and compressed directly to the supercritical state in order to obtain better match with the heat source temperature and lower corresponding exergy destruction. Supercritical ORC has therefore attracted increasing attention in recent years. Supercritical fluids in the heated channels experience sharp changes in thermal properties during the pseudo-critical temperature range, leading to abnormal supercritical heat transfer characteristics. However, to the best of our knowledge, as one of the most challenging aspects related to the ORC modeling, heat transfer mechanisms for supercritical organic fluids have not been completely explained. To fill this gap, this work numerically analyzes the heat transfer to supercritical hexamethyldisiloxane (MM) with characteristics of high thermal stability and low critical parameters and therefore it is applicable for high temperature supercritical ORC system. In the numerical analysis, the shear stress transport k–ω turbulence model is employed to simulate the supercritical heat transfer process in a vertical upward tube under different boundary conditions of pressure, mass flux, and heat flux. Further insight is provided about the physical mechanisms of heat transfer deterioration with numerical results. The results show that the distributions of specific heat and turbulent kinetic energy are the key factors in determining the deterioration degree of heat transfer.
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Li, Bo, Yachao Lee, Wei Yao, Yang Lu, and Xuejun Fan. "Prediction of kerosene properties at supercritical pressures by Artificial Neural Network." In 2018 Joint Propulsion Conference. American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-4454.

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DANSBERRY, BRYAN, MICHAEL DURHAM, ROBERT BENNETT, et al. "EXPERIMENTAL UNSTEADY PRESSURES AT FLUTTER ON THE SUPERCRITICAL WING BENCHMARK MODEL." In 34th Structures, Structural Dynamics and Materials Conference. American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-1592.

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Reports on the topic "Supercritical pressures"

1

Chehroudi, B., and D. Talley. Interaction of Acoustic Waves with a Cryogenic Nitrogen Jet at Sub- and Supercritical Pressures. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada410887.

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Chehroudi, B., and Doug Talley. Interaction of Acoustic Waves with a Cryogenic Nitrogen Jet at Sub- and Supercritical Pressures. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada410897.

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Wood, R. H. Development of an experimental database and theories for prediction of thermodynamic properties of aqueous electrolytes and nonelectrolytes of geochemical significance at supercritical temperatures and pressures. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/5290625.

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Shock, Everett L. Development of an Experimental Database and Theories for Prediction of Thermodynamic Properties of Aqueous Electrolytes and Nonelectrolytes of Geochemical Significance at Supercritical Temperatures and Pressures. Office of Scientific and Technical Information (OSTI), 2007. http://dx.doi.org/10.2172/908676.

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Wood, R. H., L. Hnedkovsky, Ching Lung Lin, and E. L. Shock. Development of an experimental data base and theories for prediction of thermodynamic properties of aqueous electrolytes and nonelectrolytes of geochemical significance at supercritical temperatures and pressures. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/7079734.

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Wood, Robert H. Development of an Experimental Data Base and Theories for Prediction of Thermodynamic Properties of Aqueous Electrolytes and Nonelectrolytes of Geochemical Significance at Supercritical Temperatures and Pressures. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/850529.

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Wood, R. H., L. Hnedkovsky, Ching Lung Lin, and E. L. Shock. Development of an experimental data base and theories for prediction of thermodynamic properties of aqueous electrolytes and nonelectrolytes of geochemical significance at supercritical temperatures and pressures. Annual performance report. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10182216.

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Zhen Fan, Steve Goidich, Archie Robertson, and Song Wu. Ultra-Supercritical Pressure CFB Boiler Conceptual Design Study. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/908300.

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Chehroudi, B., and D. G. Talley. High Pressure and Supercritical Combustion: Interactions of Jets with Acoustic Waves. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada405725.

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Sun, Wenting. INVESTIGATION OF AUTOIGNITION AND COMBUSTION STABILITY OF HIGH PRESSURE SUPERCRITICAL CARBON DIOXIDE OXY-COMBUSTION. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1577356.

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