The Joule-Thomson Effect, Its Inversion and Other Expansions

Maytal, Ben-Zion; Pfotenhauer, John M.

doi:10.1007/978-1-4419-8285-8_2

Cited by 5 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At room temperature (300 K), the real gases except hydrogen, helium and neon cool during expansion according to the Joule-Thomson (J-T) effect. 20,21 Therefore, when the compressed air is discharged from a container or flows through a pressure regulator, the air temperature drops. In the APE, the inside cylinder of the APE is a typical location where the air gets cold because the compressed air expands in it.…”

Section: Locations Of the Temperature Dropmentioning

confidence: 99%

Study on the temperature compensation technology of air-powered engine

Shi

Sun

Cai

et al. 2015

Journal of Renewable and Sustainable Energy

View full text Add to dashboard Cite

First, the principle of the temperature drop in the air-powered engine (APE) is studied in this paper. The thermodynamic model of the APE and the calculation model for equivalent air temperatures in critical locations of the APE are proposed. Second, through the calculation by the models above, the temperature drop of the APE causes the ice blocking to influence the APE working negatively. And it is a particular problem that conventional gasoline engines will not meet. To solve the ice blocking problem without consuming additional energy out of the APE system, a heat exchange structure for the APE is designed to compensate the drop temperature and make sure the APE work efficiently. To verify the APE works in a good temperature distribution situation, some simulations are done, it is shown that the APE with the heat exchange structure works better in temperature distribution and ice blocking prevention. In addition to this, the results of simulation are verified by experiments. In conclusion, the APE with the heat exchange structure can avoid the ice blocking problem. Besides, it can help improve the APE's working efficiency by about 30%. The study provides a theoretical basis for further research on the principle of the temperature drop and heat exchange in the APE. V C 2015 AIP Publishing LLC. [http://dx.

show abstract

Section: Locations Of the Temperature Dropmentioning

confidence: 99%

Study on the temperature compensation technology of air-powered engine

Shi

Sun

Cai

et al. 2015

Journal of Renewable and Sustainable Energy

View full text Add to dashboard Cite

show abstract

“…The Joule-Thomson effect contribution to the total cooling of the mixture can be evaluated by the integral isenthalpic Joule-Thomson effect (Gustafsson, 1970;Maytal and Pfotenhauer, 2013), which can be defined as the temperature drop when the mixture is subject to a given decompression:…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of High CO2 Content Flows in Production Wells, Flowlines and Risers

Carneiro

Pasqualette

Reyes

et al. 2015

Day 2 Wed, October 28, 2015

View full text Add to dashboard Cite

There are several challenges associated to the pre-salt development at the Santos basin, such as long distances from the coast, low temperature reservoirs, high pressures, high water depth, among others. Additional aspects contributing to the complex production scenario are related to fluid characteristics and flow assurance. In particular, the high CO 2 content in the dissolved gas is an important characteristic that should be also analyzed, because CO 2 is not only a heavy component, when compared to lighter components present in the gas phase, but has also a high Joule-Thomson coefficient. This affects pressure drop and specially the mixture cooling behavior during decompression. The cooling effect is expected to be strong at high production rates. Thus, the objective of the present work is to evaluate these effects under present and future production scenarios, taking into account increasing CO 2 contents due to re-injection strategies.Two different field configurations were investigated and a variety of operating conditions was used, along with real and model fluids ranging from 5% to 50% CO 2 content (molar basis). PVT data for the model fluids with high CO 2 content were generated by a simulated swelling test with CO 2 of an existing mixture with lower CO 2 content. A parametric study was carried out aiming at investigating primarily the total pressure and temperature drop in the pipeline when the total CO 2 content of the mixture is increased. Furthermore, variation of the fluid properties along the well, flowline and riser was evaluated. Results are also discussed in view of the impact of increasing CO 2 contents and the challenges experienced during simulation of such flows.

show abstract

“…A clue to the route by which heat is transmitted through the corona to the solar wind is provided by the predominance of H and He in the Sun's composition. These are two of the three gases (the third is neon) with such a low inversion temperature that is above ambient temperature and under isoenthalpic conditions, their response to the Joule-Thomson effect is heating rather than cooling [22]. In the absence of experimental data for coronal temperatures we must rely on extrapolation of inversion curves [23], but to advance the discussion we note that at very high temperatures the Joule-Thomson coefficient μJT may be represented by -b/Cp [24], where b is of course one of the two constants that distinguish the van der Waals equation from the Real Gas Law and that vary according to the gas at issue, and Cp is the heat capacity.…”

mentioning

confidence: 99%

The Solar Chromosphere as Induction Disk and The Inverse Joule-Thomson Effect

Vita‐Finzi¹

2023

EESRR

View full text Add to dashboard Cite

The connection between nuclear fusion in the Sun’s core and solar irradiance is obscured among other things by uncertainty over the mechanism of coronal heating. Data for solar wind density and velocity, sunspot number, and EUV flux suggest that electromagnetic energy from the Sun’s convection zone is converted by induction through the chromosphere into thermal energy. The helium and hydrogen mixture exhaled by the Sun is then heated by the inverse Joule-Thomson effect when it expands via the corona into space. The almost complete shutdown of the solar wind on 10-11 May 1999 demonstrated that its velocity is a more faithful indicator of solar activity than are sunspots as it reflects short-term variations in coronal heating rather than quasicyclical fluctuations in the Sun’s magnetism. Its reconstruction from the cosmic ray flux using isotopes spanning over 800,000 yr should therefore benefit the analysis and long-term forecasting of Earth and space weather

show abstract

The Joule-Thomson Effect, Its Inversion and Other Expansions

Cited by 5 publications

References 22 publications

Study on the temperature compensation technology of air-powered engine

Study on the temperature compensation technology of air-powered engine

Numerical Simulations of High CO2 Content Flows in Production Wells, Flowlines and Risers

The Solar Chromosphere as Induction Disk and The Inverse Joule-Thomson Effect

Contact Info

Product

Resources

About