Results 91 to 100 of about 24,409 (308)

Instability of supercritical helium flow.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, 1991
The instability of supercritical helium flow is investigated experimentally, Three types of instabillity are observed and their mechanisms are revealed. A type of instability is considered to be a Helmholtz one, caused by the acoustic resonance in the outlet pipe from the cryostat outlet to the flow control valve.
FUKUDA, Kenji, HASEGAWA, Shu, KONDOH, Tetsuya, NOZAKI, Fumihide, NAGAYOSHI, Takuji   +4 more
openaire   +1 more source

Chlorella vulgaris biorefineries: sustainable biofuels and high‐value carbon capture

Biofuels, Bioproducts and Biorefining, EarlyView.
Abstract Global reliance on fossil fuels has created urgent economic and environmental challenges, yet large‐scale use of algal biomass remains limited by production costs. Industrial scaling is constrained by inefficient harvesting and the technical challenges of processing recalcitrant cell walls.
Sandyelle Ferreira Alcântara Araújo, Antonio Átila Menezes Ferreira, Lucia Andrea Sindeaux de Oliveira, Dayana Nascimento Dari, Devany Quintela Soares, Eliana Elisa Francelino Mavie, Francisco Leonardo Alves de Moraes Sousa, Jessica Lopes da Silva, João Vitor Gomes de Araújo Silva, Thiago Queiroz da Silva, Ana Karine Portela Vasconcelos, Kelma Maria dos Santos Pires Cavalcante, John Hebert da Silva Felix, José Cleiton Sousa dos Santos   +13 more
wiley   +1 more source

Numerical Analysis of Mechanism on Heat Transfer Deterioration of Hexamethyldisiloxane in a Vertical Upward Tube at Supercritical Pressures [PDF]

Journal of Applied Fluid Mechanics
The working fluids at supercritical pressures will experience abnormal heat transfer compared with those in a sub-critical state. In particular, the heat transfer deterioration (HTD) can make the wall temperature increase sharply in the tube, posing a ...
J. Fu, H. Y. Liu, Y. Wang
doaj   +1 more source

Studies in transonic flow

, 1983
This thesis is divided into, two distinct parts. Part I describes the design and development of an intermittent cryogenic wind-tunnel, in which the cold conditions are generated by the expansion of high pressure gas.
Mohan, S. R.
core  

Life cycle assessment of biodiesel synthesis from waste cooking oil using bifunctional heterogeneous catalyst

Biofuels, Bioproducts and Biorefining, EarlyView.
Abstract The development of renewable energy sources is important in order to achieve the United Nations Sustainable Development Goals (SDGs). Waste cooking oil (WCO) is a promising feedstock for biodiesel production through transesterification. Heterogeneous bifunctional catalysts offer a sustainable alternative to conventional homogeneous bases such ...
Frederick Jit Fook Phang, Jocelyn Ling Hui Jong, Michael Toh Yang Wong, Jiuan Jing Chew, Lusi Ernawati, Diah Agustina Puspitasari, Fuping Li, Yen San Chan, Basil T. Wong, Jaka Sunarso   +9 more
wiley   +1 more source

Biomass‐Coupled HER System: A Strategy for Sustainable and Low‐Cost Hydrogen Production

Carbon Energy, EarlyView.
Pine wood is carbonized into a hierarchically porous biochar anode that undergoes carbon oxidation reaction, replacing the oxygen evolution reaction in alkaline water electrolysis. The resulting biomass‐coupled HER system converts water into hydrogen at low cell voltages, enabling low‐cost H2 production from renewable carbon resources. ABSTRACT Biomass‐
Yuming Huang, Wei Zhou, Liang Xie, Miaoting Sun, Junfeng Li, Xuewei Zhang, Jiaxiang Chen, Xiaoxiao Meng, Jihui Gao, Guangbo Zhao, Bo Song   +10 more
wiley   +1 more source

Continuous flow homogeneous catalysis using ionic liquid/supercritical fluid biphasic systems

, 2010
Ionic liquid/scCO₂ biphasic systems have been studied as a possible solution to the main problems concerning homogeneous catalysis reactions such as, the product/catalyst separation, the catalyst retention in the reaction medium and the use of organic
Martins, Tânia Isabel Quintas
core  

Optimization of supercritical fluid extraction: Polydisperse packed beds and variable flow rates [PDF]

, 2014
© 2015 Elsevier B.V. This theoretical study examines variable-in-time flow rates v(t) and different ways of packing polydisperse ensemble of ground particles as controls in supercritical fluid extraction (SFE) to maximize the extraction yield.
Egorov A., Salamatin A.
core  

Caffeine Solubility In Supercritical Carbon Dioxide/co-solvent Mixtures

, 2015
In order to assess the effect of co-solvents on the solubility of caffeine in supercritical carbon dioxide, experimental solubility of caffeine in supercritical ethanol-carbon dioxide and isopropanol-carbon dioxide mixed solvents was obtained using a ...
Kopcak U., Mohamed R.S.
core   +1 more source

A Methodology to Integrate Closed‐Cycle Heat Pumps into Batch Distillation Columns

Chemie Ingenieur Technik, EarlyView.
Batch distillation often cannot use vapor recompression due to contamination risks in food and pharma. This study proposes a design for integrating closed‐loop heat pumps using natural fluids. Results show significant energy savings, offering a sustainable alternative to traditional setups.
Philipp Dorn, Michael Libuda, Thomas Meyer, Christian Hoffmann, Jens‐Uwe Repke, Stefan Elbel   +5 more
wiley   +1 more source