This paper reports a Joule-Thomson cooling system that provides 0.1-1 W cooling power using a micromachined Si/glass perforated plate heat exchanger. The gas expansion is performed through a micromachined valve that is piezoelectrically actuated, or alternatively through a commercial jewel orifice. The modulated J-T system using the microvalve can achieve 254.5 K at a pressure difference of 430...

Among the alternative fuels enabling energy transition, hydrogen-based transportation is a sustainable and efficient choice. It finds application both in light-duty heavy-duty mobility. However, hydrogen gas has unique qualities that must be taken into account when employed such vehicles: high-pressure levels up to 900 bar, storage composite tanks with temperature limit of 85 °C, negative Joule...

An accurate temperature profile of the multi-stage fractured horizontal well is foundation production interpretation using distributed sensing. In this paper, an oil-water two-phase flow prediction model considering stress sensitivity effect and Joule–Thomson constructed. Based on simulation calculation, wellbore variation under different formation parameters, water cuts, fracture parameters di...

Assessment of the natural gas specific humidity is necessary for technological calculations in production, treatment, and transportation gas. As well as knowledge dynamics allows you to calculate consumption hydrate inhibitors before their injection into wells. In this paper, bottomhole zone hole wells depending on temperature pressure have been investigated. The computational experiment was ca...

The performance of Joule-Thomson (JT) cryocoolers can be improved by introducing ejectors. Ejectors with various geometric features have been proposed and investigated for cryogenic cooling in earlier studies, but only limited research is done on ejectors a nozzle throat diameter less than 1 mm. In this paper, we present miniature ejector 162 ?m that was measured using X-ray computed tomography...

The Joule–Thomson expansion is studied for Reissner–Nordström-Anti-de Sitter black holes with cloud of strings and quintessence, as well its thermodynamics. cosmological constant treated thermodynamic pressure, whose conjugate variable considered the volume. characteristics are in four main aspects case ω=−1 ω=−23, including coefficient, inversion curves, isenthalpic curves ratio between minimu...

SPICA, a Japanese led mission, is part of the JAXA future science program and is planned for launch in 2018. SPICA will perform imaging and spectroscopic observations in the 5 to 210 mm waveband. The SPICA payload features three instruments, one of which, SAFARI, is developed by a European based consortium. SPICA’s distinctive feature is to use an actively cooled telescope down to 4 K. In addit...