Development and experimental checking of an unsteady-state model for ultrafiltration continuous tank reactors

2005 ◽  
Vol 60 (15) ◽  
pp. 4225-4232 ◽  
Author(s):  
Antonio Bódalo ◽  
José L. Gómez ◽  
Elisa Gómez ◽  
M. Fuensanta Máximo ◽  
M. Claudia Montiel
Keyword(s):  
State Model ◽  
Unsteady State

A theoretical unsteady-state model for k L of bubbles based on the framework of wide energy spectrum

AIChE Journal ◽  
2015 ◽  
Vol 62 (4) ◽  
pp. 1007-1022 ◽  
Author(s):  
Luchang Han ◽  
Jin Fu ◽  
Ming Li ◽  
Shenggao Gong ◽  
Ningning Gao ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
State Model ◽  
Unsteady State ◽  
Wide Energy ◽  
Wide Energy Spectrum

A Study on the Heat Penetrating Coupling Unsteady State Model of Heavy Oil During Steam Flooding

2013 ◽  
Vol 31 (17) ◽  
pp. 1697-1706
Author(s):  
W.-G. Li ◽  
S.-L. Yang ◽  
X.-Y. Yang ◽  
R.-R. Xu ◽  
Z.-L. Wang
Keyword(s):  
Heavy Oil ◽  
State Model ◽  
Unsteady State ◽  
Steam Flooding

scholarly journals A Steady-State Mass Transfer Model of Removing CPAs From Cryopreserved Blood With Hollow Fiber Modules

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
Weiping Ding ◽  
Xiaoming Zhou ◽  
Shelly Heimfeld ◽  
Jo-Anna Reems ◽  
Dayong Gao
Keyword(s):  
Blood Flow ◽  
Steady State ◽  
Hollow Fiber ◽  
State Model ◽  
Transfer Model ◽  
Unsteady State ◽  
Flow Rates ◽  
Dialysate Flow ◽  
Steady State Model ◽  
Mass Transfers

Hollow fiber modules are commonly used to conveniently and efficiently remove cryoprotective agents (CPAs) from cryopreserved cell suspensions. In this paper, a steady-state model coupling mass transfers across cell and hollow fiber membranes is theoretically developed to evaluate the removal of CPAs from cryopreserved blood using hollow fiber modules. This steady-state model complements the unsteady-state model, which was presented in our previous study. The steady-state model, unlike the unsteady-state model, can be used to evaluate the effect of ultrafiltration flow rates on the clearance of CPAs. The steady-state model is validated by experimental results, and then is compared with the unsteady-state model. Using the steady-state model, the effects of ultrafiltration flow rates, NaCl concentrations in dialysate, blood flow rates and dialysate flow rates on CPA concentration variation and cell volume response are investigated in detail. According to the simulative results, the osmotic damage of red blood cells can easily be reduced by increasing ultrafiltration flow rates, increasing NaCl concentrations in dialysate, increasing blood flow rates, or decreasing dialysate flow rates.

scholarly journals Transient Slug Flow Modelling of Subsea Riser Flowline System

2020 ◽  
pp. 34-46
Author(s):  
Akin-Taylor Akinbowale Moses ◽  
Tobinson A. Briggs
Keyword(s):  
Steady State ◽  
Liquid Phase ◽  
Slug Flow ◽  
Water System ◽  
Transient State ◽  
State Model ◽  
Quasi Steady State ◽  
Unsteady State ◽  
Spring System ◽  
Mass Spring

A gas-water system slug velocity was modelled with slug flow like a train of slug units streaming through a steel flowline riser of roughness 0.025 was modelled, the flowline was 2700 m, and the riser was 100 m with a diameter of 0.254 m, with each slug unit having a liquid slug of 100 m and its gas bubble of 200 m. Presumptuously the liquid phase was not compressible; that is, no gas was entrapped in the liquid; there is also no liquid was trapped within the gas. Unsteady state flow was modelled as a mass-spring system with damping. Liquid phase represented the mass, whereas the gas represented the spring and damping as the force of friction that acts on the fluids in motion by the wall. A quasi-steady-state model having a slug velocity of 4 ms-1 was used to simplify the numerical correlations and algorithm and to relate with outcomes of the unsteady state model.  Outputs from both models show that pressure and rate vary sinusoidally at fixed points in the system. Both models are unconcealed that the velocity of every slug unit was most at the end of flowline to the separator. The result from the transient state model is complex for weighing up with other results from the literature. This procedure was as a product of over-simplification owing to some assumptions made. Also, simultaneous solutions to the differential equations were solved with hand. It is determined that quasi-steady-state outputs are more reliable than the unsteady state model for flowlines that are not situated on heaving surfaces because the model is less complicated and follows the predictable trend.

Unsteady-state model of a nonthermal plasma reactor

2012 ◽  
Vol 74 ◽  
pp. 18-26 ◽  
Author(s):  
Hongmei Chen ◽  
Yanan Zhao ◽  
Shiyu Tan ◽  
Xiaohua Zhou ◽  
Lichun Dong
Keyword(s):  
Plasma Reactor ◽  
Nonthermal Plasma ◽  
State Model ◽  
Unsteady State
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