The injection of cryogenic fluids into environments where the prevailing conditions are supercritical in comparison to critical point injected fluid is encountered rocket engines, and novel engine architectures such as recuperated split cycle engine. physical characteristics cryogens environment rather unclear. While surface tension usually assumed be absent/negligible for fluids, recent experi...

Study on ambient and cryogenic grinding was performed to test the novelty of cryogenic grinding and pin point the drawbacks of ambient grinding. Comparative study had shown that ambient grinding need more power (8.92%) and specific energy (14.5%) than cryogenic grinding. Particle size analysis had shown that cryogenic grinding produced coarser particles. Comparative study of energy law constant...

The DLR LUMEN (Liquid Upper stage deMonstrator ENgine) rocket engine comprises of two separate turbopumps, one each for Liquid Oxygen (LOX) and Liquified Natural Gas (LNG) supply. In both an identical bearing block separates the pump section from turbine section. current design, features oil-jet lubrication system to cool lubricate bearings during operation. Cryogenic conditions at pump-interfa...

Article history: Received: 09.06.2015. Received in revised form: 01.10.2015. Accepted: 08.10.2015. Liquid nitrogen is expected to be used as a jet medium in petroleum engineering because of its cryogenic and non-polluting characteristics. To identify the velocity distribution characteristics of liquid nitrogen jet, a computational fluid dynamics model was built by coupling the equations for nit...

XeBRA is a flexible cryogenic platform designed to perform research and development for liquid xenon detectors searching rare events. Its extra-large outer cryostat makes it possible install wide variety of detector designs. We present the system, including its cryogenic, gas handling, data acquisition slow control subsystems. Two dual phase time projection chambers with sensitive masses at 1 k...

Nitrogen is produced mainly from its most abundant source, the air, using three processes: membrane, pressure swing adsorption (PSA) and cryogenic. The most common method for evaluating a process is using the selection diagrams based on feasibility studies. Since the selection diagrams are presented by different companies, they are biased, and provide unsimilar and even controversial results. I...

Ammodendron persicum (Bunge & Boiss.)is a desert shrub specie which grows on some sand dunes and sandy areas of South Khorasan and Sistan-va-Baluchestan provinces in east of Iran. Low distribution and narrow ecological range have put this species under threat. In order to evaluate the possibility of long-term preservation of A. persicum seeds in cryogenic conditions (-196°C), the seeds of speci...