Semi-batch and continuous production of Pickering emulsion via direct contact steam condensation

Soft Matter ◽  
2021 ◽  
Author(s):  
Nithin Madhavan ◽  
Eswararao Yalla ◽  
S. Pushpavanam ◽  
T. Renganathan ◽  
Manas Mukherjee ◽  
...  
Keyword(s):  
Direct Contact ◽  
Continuous Production ◽  
Pickering Emulsion ◽  
Steam Condensation ◽  
Conventional Methods ◽  
Contact Condensation

We propose a versatile strategy for the production of highly stable water in oil Pickering emulsion by direct contact condensation of steam. In contrast to conventional methods that use of...

Methodology to Investigate Vibration Phenomena Caused by the Steam Condensation at Subatmospheric Condition

2017 ◽  
Author(s):  
R. Lo Frano ◽  
D. Mazed ◽  
D. Aquaro ◽  
D. Del Serra ◽  
I. Sekachev ◽  
...  
Keyword(s):  
Direct Contact ◽  
Vacuum Vessel ◽  
Nuclear Engineering ◽  
Atmospheric Conditions ◽  
Steam Condensation ◽  
The Past ◽  
Experimental Campaign ◽  
Hydraulic Conditions ◽  
Contact Condensation ◽  
Suppression System

The phenomenon of steam-water direct contact condensation (DCC) was widely investigated in the past because of conventional and nuclear engineering applications, like in the safety suppression system of BWRs. When steam is injected into a sub cooled water, different condensation regimes can be observed, such as chugging, condensation oscillation, bubbling condensation oscillation etc. (these have been identified during the experimental campaign on condensation of steam injected into water at sub-atmospheric conditions carried out at Lab. B. Guerrini of DICI - University of Pisa). According to the thermal hydraulic conditions of the condensing jet plume, vibrations may arise. This paper so deals with the analysis of vibration phenomena that originate during the steam-water direct contact condensation at sub-atmospheric conditions, not treated till today. Numerical investigations (by proper FEM code) as well as experimental activity will be presented and discussed in order to evaluate if vibrations are capable to jeopardise this safety suppression system, which is designed to protect Vacuum Vessel of ITER from pressurizing accidents.

DIRECT CONTACT CONDENSATION OF FLOWING STEAM ONTO INJECTED WATER

1978 ◽  
Author(s):  
Shigebumi Aoki ◽  
Akira Inoue ◽  
Yoshiyuki Kozawa ◽  
H. Akimoto
Keyword(s):  
Direct Contact ◽  
Contact Condensation

Reduce odor and NH3 emission: condensation of the carbonatation vapors

2017 ◽  
pp. 534-537
Author(s):  
Nico Antens ◽  
Jan L.M. Struijs
Keyword(s):  
Direct Contact ◽  
Waste Heat ◽  
Pilot Scale ◽  
Sugar Production ◽  
Two Stage ◽  
Indirect Contact ◽  
Nh3 Emission ◽  
Emission Limits ◽  
Plant Trials ◽  
Contact Condensation

At beet sugar production, vapors from first and second carbonatation contain a significant amount of odor components, NH3 and waste heat, which are normally directly released into the environment. Due to sustainability motivations, obligations regarding odor nuisance and expected stricter regulations regarding NH3 emission limits, Suiker Unie decided to take measures to reduce emission via the carbonatation vapors. During the 2015 beet campaign, pilot scale plant trials have been performed to investigate the effectiveness of indirect contact and direct contact condensation of these vapors. Based on this experimental work a two-stage gas scrubbing concept was designed: in the first stage main goal is condensing the vapors and reuse the heat of condensation to heat up limed juice, while the actual scrubbing takes place in the second scrubber. This two-stage gas scrubbing installation has been built at the Vierverlaten factory and was started up in the 2016 beet campaign. The background, pilot scale trials, concept of design and achieved reductions in odor and NH3 emission at industrial scale are discussed.

A Physically Based, One-Dimensional Two-Fluid Model for Direct Contact Condensation of Steam Jets Submerged in Subcooled Water

2015 ◽  
Vol 1 (2) ◽  
Author(s):  
David Heinze ◽  
Thomas Schulenberg ◽  
Lars Behnke
Keyword(s):  
Direct Contact ◽  
Two Phase Flow ◽  
Fluid Model ◽  
Interfacial Area ◽  
Phase Flow ◽  
Two Phase ◽  
One Dimensional ◽  
Two Fluid Model ◽  
Contact Condensation ◽  
Two Fluid

A simulation model for the direct contact condensation of steam in subcooled water is presented that allows determination of major parameters of the process, such as the jet penetration length. Entrainment of water by the steam jet is modeled based on the Kelvin–Helmholtz and Rayleigh–Taylor instability theories. Primary atomization due to acceleration of interfacial waves and secondary atomization due to aerodynamic forces account for the initial size of entrained droplets. The resulting steam-water two-phase flow is simulated based on a one-dimensional two-fluid model. An interfacial area transport equation is used to track changes of the interfacial area density due to droplet entrainment and steam condensation. Interfacial heat and mass transfer rates during condensation are calculated using the two-resistance model. The resulting two-phase flow equations constitute a system of ordinary differential equations, which is solved by means of the explicit Runge–Kutta–Fehlberg algorithm. The simulation results are in good qualitative agreement with published experimental data over a wide range of pool temperatures and mass flow rates.

Direct Contact Condensation of Steam in Subcooled Water

2018 ◽  
pp. 337-362
Author(s):  
Priyankan Datta ◽  
Aranyak Chakravarty ◽  
Koushik Ghosh ◽  
Achintya Mukhopadhyay ◽  
Swarnendu Sen
Keyword(s):  
Direct Contact ◽  
Subcooled Water ◽  
Contact Condensation
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