Relevant bibliographies by topics / Isenthalpic expansion

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Academic literature on the topic 'Isenthalpic expansion'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Isenthalpic expansion"

1

Maytal, B. Z. "Post-isenthalpic expansion temperature." Cryogenics 35, no. 1 (1995): 69–70. http://dx.doi.org/10.1016/0011-2275(95)90429-j.

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2

Ahmed Rizwan, C. L., A. Naveena Kumara, Deepak Vaid, and K. M. Ajith. "Joule–Thomson expansion in AdS black hole with a global monopole." International Journal of Modern Physics A 33, no. 35 (2018): 1850210. http://dx.doi.org/10.1142/s0217751x1850210x.

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In this paper, we investigate the Joule–Thomson effects of AdS black holes with a global monopole. We study the effect of the global monopole parameter [Formula: see text] on the inversion temperature and isenthalpic curves. The obtained result is compared with Joule–Thomson expansion of van der Waals fluid, and the similarities were noted. Phase transition occuring in the extended phase space of this black hole is analogous to that in van der Waals gas. Our study shows that global monopole parameter [Formula: see text] plays a very important role in Joule–Thomson expansion.
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3

Mat Jusoh, Firdaus, Henry Nasution, Azhar Abdul Aziz, et al. "Performance of Automotive Air-Conditioning System by Using Ejector as an Expansion Device." Applied Mechanics and Materials 819 (January 2016): 216–20. http://dx.doi.org/10.4028/www.scientific.net/amm.819.216.

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An automotive air conditioning system that uses thermal expansion valve (TEV) as an expansion device. The pressure drop from the condenser and evaporator pressure is considered an isenthalpic process (constant enthalpy), where this process causes energy loss (entropy generation) in the expansion process. The ejector recovers energy losses, which was previously lost in the expansion valve, and an ejector can be used to generate isentropic condition in the expansion process. The use of an ejector as an expansion device in this study can reduce power consumption of the compressor and increase cooling capacity of the evaporator. The experiments were conducted with temperature set-points of the conditioned space of 21, 22 and 23°C with internal heat loads of 100, 200 and 400 W. Measurements were taken during the one hour experimental period at a time interval of five minutes. The experiment results indicate that the ejector system is better than TEV and save fuel.
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4

Satyro, Marco A., Florian Schoeggl, and Harvey W. Yarranton. "Temperature change from isenthalpic expansion of aqueous triethylene glycol mixtures for natural gas dehydration." Fluid Phase Equilibria 305, no. 1 (2011): 62–67. http://dx.doi.org/10.1016/j.fluid.2011.03.011.

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5

Jawad, Abdul, Muhammad Yasir, and Shamaila Rani. "Joule–Thomson expansion and quasinormal modes of regular non-minimal magnetic black hole." Modern Physics Letters A 35, no. 36 (2020): 2050298. http://dx.doi.org/10.1142/s0217732320502983.

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The Joule–Thomson effect and quasinormal modes (QNM) onto regular non-minimal magnetic charged black hole with a cosmological constant are being investigated. For this purpose, we extract some thermodynamical parameters such as pressure [Formula: see text] and mass [Formula: see text] in the presence of magnetic [Formula: see text] as well as electric [Formula: see text] charge. These parameters lead to inversion temperature [Formula: see text], pressure [Formula: see text] and corresponding isenthalpic curves. We introduce the tortoise coordinate and the Klein–Gordon wave equation which leads to the second-order ordinary Schrödinger equation. We find out the complex frequencies of QNMs through the massless scalar field perturbation which satisfy boundary conditions by using the first-order Wentzel–Kramers–Brillouin (WKB) technique.
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6

Guo, Sen, Yan Han, and Guo Ping Li. "Thermodynamic of the charged AdS black holes in Rastall gravity: P − V critical and Joule–Thomson expansion." Modern Physics Letters A 35, no. 14 (2020): 2050113. http://dx.doi.org/10.1142/s0217732320501138.

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In this paper, we study the thermodynamic of the charged AdS black holes in Rastall gravity. Firstly, the thermodynamic quantities of the charged AdS black holes in Rastall gravity are reviewed and the state equation of this black hole is obtained. Then, we investigate the [Formula: see text] critical and the Joule–Thomson expansion of the charged AdS black holes in Rastall gravity in which the critical temperature and the critical exponents are obtained. In addition, we get the inversion temperature and plot the isenthalpic and inversion curves in the [Formula: see text] plane, and also determine the cooling-heating regions of this black hole through the Joule–Thomson expansion. Finally, we investigate the ratio between the minimum inversion and critical temperatures, and find that the Rastall constant [Formula: see text] does not affect of this ratio.
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7

Györke, Gábor, and Attila R. Imre. "Physical-chemical Background of the Potential Phase Transitions during Loss of Coolant Accidents in the Supercritical Water Loops of Various Generation IV Nuclear Reactor Types." Periodica Polytechnica Chemical Engineering 63, no. 2 (2019): 333–39. http://dx.doi.org/10.3311/ppch.12770.

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Loss of coolant accidents (LOCA) are a serious type of accidents for nuclear reactors, when the integrity of the liquid-loop breaks. While in traditional pressurized water reactors, pressure drop can cause flash boiling, in Supercritical-Water Cooled reactors, the pressure drop can be terminated by processes with fast phase transition (flash boiling or steam collapse) causing pressure surge or the expansion can go smoothly to the dry steam region. Modelling the pressure drop of big and small LOCAs as isentropic and isenthalpic processes and replacing the existing reactor designs with a simplified supercritical loop, limiting temperatures for various outcomes will be given for 24.5 and 25 MPa initial pressure. Using the proposed method, similar accidents for chemical reactors and other equipment using supercritical fluids can be also analyzed, using only physical-chemical properties of the given supercritical fluid.
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8

Yarveicy, Hamidreza, Mohammad M. Ghiasi, and Amir H. Mohammadi. "Determination of the gas hydrate formation limits to isenthalpic Joule–Thomson expansions." Chemical Engineering Research and Design 132 (April 2018): 208–14. http://dx.doi.org/10.1016/j.cherd.2017.12.046.

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9

Mirza, Behrouz, Fatemeh Naeimipour, and Masoumeh Tavakoli. "Joule-Thomson Expansion of the Quasitopological Black Holes." Frontiers in Physics 9 (April 19, 2021). http://dx.doi.org/10.3389/fphy.2021.628727.

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In this paper, we investigate the thermal stability and Joule-Thomson expansion of some new quasitopological black hole solutions. We first study the higher-dimensional static quasitopological black hole solutions in the presence of Born-Infeld, exponential, and logarithmic nonlinear electrodynamics. The stable regions of these solutions are independent of the types of the nonlinear electrodynamics. The solutions with horizons relating to the positive constant curvature, k=+1, have a larger region in thermal stability, if we choose positive quasitopological coefficients, μi>0. We also review the power Maxwell quasitopological black hole. We then obtain the five-dimensional Yang-Mills quasitopological black hole solution and compare it with the quasitopological Maxwell solution. For large values of the electric charge, q, and the Yang-Mills charge, e, we showed that the stable range of the Maxwell quasitopological black hole is larger than the Yang-Mills one. This is while thermal stability for small charges has the same behavior for these black holes. Thereafter, we obtain the thermodynamic quantities for these solutions and then study the Joule-Thomson expansion. We consider the temperature changes in an isenthalpic process during this expansion. The obtained results show that the inversion curves can divide the isenthalpic ones into two parts in the inversion pressure, Pi. For P<Pi, a cooling phenomenon with positive slope happens in T−P diagram, while there is a heating process with a negative slope for P>Pi. As the values of the nonlinear parameter, β, the electric and Yang-Mills charges decrease, the temperature goes to zero with a small slope and so the heating phenomena happens slowly.
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10

Ayala H., Luis F., and Ting Dong. "Thermodynamic Analysis of Thermal Responses in Horizontal Wellbores." Journal of Energy Resources Technology 137, no. 3 (2014). http://dx.doi.org/10.1115/1.4028697.

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Wellbore models are required for integrated reservoir management studies as well as optimization of production operations. Distributed temperature sensing (DTS) is a smart well technology deployed for permanent downhole monitoring. It measures temperature via fiber optic sensors installed along horizontal wellbores. Correct interpretation of DTS surveys has thus become of utmost importance and analytical models for analysis of temperature distribution behavior are critical. In this study, we first show how thermodynamic analysis can describe in detail the physical changes in terms of pressure and temperature behavior from the simplest cases of “leaky tank” to the horizontal wellbore itself. Subsequently, rigorous single-phase thermodynamic models for energy, entropy, and enthalpy changes in horizontal wellbores are derived starting from 1D conservative mass, momentum, and energy balance equations and a generalized thermal models, along with their steady-state temperature profile subsets, are presented. Steady-state applications are presented and discussed. The analysis presents the factors controlling horizontal wellbore steady-state temperature responses and demonstrates that wellbore thermal responses are neither isentropic nor isenthalpic and that the isentropic expansion-driven models and Joule–Thompson-coefficient (JTC) driven may be used interchangeably to analysis horizontal wellbore thermal responses.
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Books on the topic "Isenthalpic expansion"

1

Papell, S. Stephen. Acquisition and correlation of cryogenic nitrogen mass flow data through a multiple orifice Joule-Thomson device. NASA, 1990.

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2

H, Saiyed Naseem, Nyland Ted W, and United States. National Aeronautics and Space Administration., eds. Acquisition and correlation of cryogenic nitrogen mass flow data through a multiple orifice Joule-Thomson device. NASA, 1990.

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Conference papers on the topic "Isenthalpic expansion"

1

Sakashita, Takeya, Chungpyo Hong, and Yutaka Asako. "Total Temperature Measurement of Gas at Microtube Outlet." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71146.

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This paper describes experimental results on the total temperature measurement of gas at the microtube exit. In order to measure the total temperature at the microtube outlet, two total temperature measuring devices with different structures were fabricated. One is six plastic baffle plates embedded inside with a thermally insulated exterior foamed polystyrene tube. The other is two glass fiber thimbles embedded inside it. The gas velocity was reduced by the plastic plates and the glass fiber thimbles, and the kinetic energy was converted into thermal energy. The fundamental premise of the total temperature measurement is the Joule Thomson effect present in real gases, which for a positive of the Joule Thomson coefficient involves the decrease in temperature when the gas experiences isenthalpic expansion. A PEEK microtube whose nominal inner diameter and outer diameter were 500 μmm and 1.6 mm, was used for assessing exact measurement of total temperature in the temperature measuring tube, since the thermal conductivity of the PEEK tube is very low. The measured total temperatures were compared with those obtained theoretically with the Joule Thomson coefficient and given thermodynamics properties.
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Novotny, Vaclav, Monika Vitvarova, Michal Kolovratnik, et al. "Design and Manufacturing of a Metal 3D Printed kW Scale Axial Turboexpander." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91822.

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Abstract Greater expansion of distributed power and process systems based on thermodynamic cycles with single to hundred kW scale power output is limited mainly there are not available cost-effective expanders. Turboexpanders have a perspective of high efficiency and flexibility concerning operating parameters even for the micro applications. However, they suffer from a high manufacturing cost and lead time in the development of traditional technologies (such as casting and machining processes). Additive manufacturing provides a possibility to overcome some of the issues. Manufacturing parts with complicated shapes by this technology, combining multiple components into a single part or rapid production by 3D printing for development purposes are among the prospective features with this potential. On the other hand, the 3D printing processes come with certain limitations which need to be overcome. This paper shows a design and manufacturing process of a 3 kW axial impulse air turbine working with isenthalpic drop 30 kJ/kg. Several samples to verify printing options and the turbine itself has been manufactured from stainless steel by the DMLS additive manufacturing method. Manufactured are two turbine variations regarding blade size and 3D printer settings while maintaining their specific dimensions. The turboexpanders testing method and rig is outlined. As the surface quality is an issue, several methods of post-processing of 3D printed stator and rotor blading to modify surface quality are suggested. Detailed experimental investigation is however subject of future work.
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3

Ancona, M. A., M. Bianchi, L. Branchini, et al. "A Novel Small Scale Liquefied Natural Gas Production Process at Filling Stations: Thermodynamic Analysis and Parametric Investigation." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56463.

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In the last years, the increased demand of the energy market has led to the increasing penetration of renewable energies in order to achieve the primary energy supply. However, simultaneously natural gas still plays a key role in the energy market, mainly as gaseous fuel for stationary energy generation, but also as liquefied fuel, as an alternative to the diesel fuel, in vehicular applications. Liquefied Natural Gas (LNG) is currently produced in large plants directly located at the extraction sites. In this study, the idea of realizing plug & play solutions to produce LNG directly at vehicle’s filling stations has been investigated. A novel process of LNG production for filling stations has been analyzed, consisting in a single stage Joule-Thompson isenthalpic expansion process, with intercooled compression. Furthermore, the presented layout has been developed with the purpose of optimizing the energy consumption of the plant, obtaining moderately pressurized LNG. With the aim of investigating the feasibility of this novel LNG generation process, a thermodynamic analysis has been carried out and presented in this study. Moreover, the minimization of energy consumption has been investigated with a parametric analysis, in order to optimize the LNG production and to maximize the efficiency of the process. Furthermore, novel performance indicators have been defined, in order to account the efficiency of the LNG production process. Results of the optimization analysis show that, with the proposed layout, an energy consumption equal to about 1.9 MJ/kg of produced LNG can be achieved.
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4

Widyaparaga, Adhika, Masashi Kuwamoto, Naoya Sakoda, Masamichi Kohno, and Yasuyuki Takata. "Theoretical Study of a Flexible Wiretype Joule Thomson Micro-Refrigerator for Use in Cryosurgery." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30127.

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We have developed a model capable of predicting the performance characteristics of a wiretype Joule-Thomson microcooler intended for use within a cryosurgical probe. Our objective was to be able to predict evaporator temperature, temperature distribution and cooling power using only inlet gas properties as input variables. To achieve this, the model incorporated changing gas properties due to heat transfer within the heat exchanger and isenthalpic expansion within the capillary. In consideration of inefficiencies, heat in-leak from free convection and radiation was also considered and the use of a 2D axisymmetric finite difference code allowed simulation of axial conduction. Two types of microcoolers differing in inner tube material, poly-ether-ether-ketone (PEEK) and stainless steel, were tested and simulated. CO2 was used as the coolant gas in the calculations and experimental trials for inlet pressures from 0.5 MPa to 2.0 MPa. Heat load trials of up to 550 mW along with unloaded trials were conducted. Comparisons to experiments show that the model was successfully able to obtain a good degree of accuracy. For the all PEEK microcooler in a vacuum using 2.0 MPa inlet pressure, the calculations predicted a temperature drop of 57 K and mass flow rate of 19.5 mg/s compared to measured values of 63 K and 19.4 mg/s therefore showing that conventional macroscale correlations can hold well for turbulent microscale flow and heat transfer as long as the validity of the assumptions is verified.
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