scholarly journals Modeling Of Infrared Drying Of Polymer Solutions

2021 ◽  
Author(s):  
MD Z Islam
Keyword(s):  
Dynamic Models ◽  
Nonlinear Partial Differential Equations ◽  
Polymer System ◽  
Drying Process ◽  
Free Volume Theory ◽  
Infrared Drying ◽  
System Temperature ◽  
Molecular Sizes ◽  
Using Data ◽  
Moving Substrate

This thesis presents the development of dynamic models for drying a coating polymer layer placed on fixed and moving substrate in a dryer using infrared (IR) heat source. The IR drying model is a set of coupled nonlinear partial differential equations (PDEs) arising from simultaneous mass and heat balances and they describe variations of the solvent concentration and the polymer system temperature during the drying process. The model was numerically solved in MATLAB environment and then validated using data from literature. Using polyvinyl acetate (in toluene) as a coating material on a polyester substrate, the simulation revealed that the model agrees with data and describes adequately well the drying kinetics. The modeling approach was also extended to simulate the drying of a polymer solution in a container. Since solvent and polymer molecular sizes are quite different, the diffusion coefficient was better described with free volume theory.

scholarly journals Modeling Of Infrared Drying Of Polymer Solutions

2021 ◽  
Author(s):  
MD Z Islam
Keyword(s):  
Dynamic Models ◽  
Nonlinear Partial Differential Equations ◽  
Polymer System ◽  
Drying Process ◽  
Free Volume Theory ◽  
Infrared Drying ◽  
System Temperature ◽  
Molecular Sizes ◽  
Using Data ◽  
Moving Substrate

This thesis presents the development of dynamic models for drying a coating polymer layer placed on fixed and moving substrate in a dryer using infrared (IR) heat source. The IR drying model is a set of coupled nonlinear partial differential equations (PDEs) arising from simultaneous mass and heat balances and they describe variations of the solvent concentration and the polymer system temperature during the drying process. The model was numerically solved in MATLAB environment and then validated using data from literature. Using polyvinyl acetate (in toluene) as a coating material on a polyester substrate, the simulation revealed that the model agrees with data and describes adequately well the drying kinetics. The modeling approach was also extended to simulate the drying of a polymer solution in a container. Since solvent and polymer molecular sizes are quite different, the diffusion coefficient was better described with free volume theory.

Solid-Liquid Separation Process: Modelling for Design and Development of Gravity Deep-Bed Filters for Water Treatment

2007 ◽  
Vol 18-19 ◽  
pp. 563-568
Author(s):  
O.E. Ekenta ◽  
B.U. Anyata
Keyword(s):  
Water Treatment ◽  
Dynamic Models ◽  
Design Development ◽  
Quality Model ◽  
Depth Filtration ◽  
Using Data ◽  
Solid Liquid ◽  
Solid Liquid Separation ◽  
Development And Management ◽  
Filter Bed

This work focuses on the conception and formulation of appropriate filtration models for use by water treatment professionals for design, development and management of deep-bed (depth) filters. Performance and optimization studies were carried out using data (turbidity, filtration rate, head loss) acquired from pilot filter test runs. The curves developed from these studies were utilized for the formulation of steady-state and hydro-dynamic models of depth filtration. An effluent quality model was developed, relating depth of flow in filter bed with effluent turbidity. This model was verified and validated. The depths obtained are in good agreement with standard values from literature.

Comparison of two model reduction approaches of an industrial drying process

2021 ◽  
Vol 69 (8) ◽  
pp. 667-682
Author(s):  
Marc Oliver Berner ◽  
Martin Mönnigmann
Keyword(s):  
Dynamic Models ◽  
Orthogonal Decomposition ◽  
Wood Chips ◽  
Residual Water ◽  
Balanced Truncation ◽  
Reduced Order Models ◽  
Drying Process ◽  
Reduced Order ◽  
Proper Orthogonal ◽  
Many Particles

Abstract Dynamic models have proven to be helpful for determining the residual water content in combustible biomass. However, these models often require partial differential equations, which render simulations impracticable when several thousand particles need to be considered, such as in the drying of wood chips. Reduced-order models help to overcome this problem. We compare proper orthogonal decomposition (POD) based to balanced truncation based reduced-order models. Both reduced models are lean enough for an application to systems with many particles, but the model based on balanced truncation shows more accurate results.

Optimization of microwave and infrared drying process of nettle leaves using design of experiments

2018 ◽  
Vol 135 (3) ◽  
pp. 1677-1685 ◽  
Author(s):  
Kamyar Movagharnejad ◽  
Fateme Vahdatkhoram ◽  
Sara Nanvakenari
Keyword(s):  
Design Of Experiments ◽  
Drying Process ◽  
Infrared Drying

Far-Infrared Drying Effects onto the Physical Characteristics of Aquilaria malaccensis Leaves

2019 ◽  
Vol 797 ◽  
pp. 196-201
Author(s):  
Habsah Alwi ◽  
Nurul Shazana Mohd Zain ◽  
Hanafiah Zainal Abidin ◽  
Jefri Jaafar ◽  
Ku Halim Ku Hamid
Keyword(s):  
Moisture Content ◽  
Manufacturing Industry ◽  
Food Product ◽  
Far Infrared ◽  
Color Difference ◽  
Drying Process ◽  
Infrared Drying ◽  
Aquilaria Malaccensis ◽  
Before And After ◽  
Very High

Drying also known as dehydration is commonly used as a unit operation in herbs manufacturing industry to preserve the food product by removing the moisture content in the herbs. Unfortunately, most drying process degraded the product quality because the feedstock is exposed to a very high temperature within a long period of time by using conventional oven Therefore this research has focused on the alternatives technique in overcoming the degradation of nutrients by applying the irradiation concepts. The objectives of this research were to investigate the effect of drying onto the physical properties of Aquilaria Malaccensis leaves by using fabricated far-infrared dryer. The experiments were conducted at various temperature ranging from 40, 50 and 60°C. The color difference and the moisture content of the leaves before and after drying were examined. The color measurements data shows that at 60°C, the brightness and the chroma were the highest. On the other hand, the hue angles were the highest for 60°C when the time was reached 100 minutes.

scholarly journals Incidence of Chlamydia trachomatis infection in women in England: two methods of estimation

2013 ◽  
Vol 142 (3) ◽  
pp. 562-576 ◽  
Author(s):  
M. J. PRICE ◽  
A. E. ADES ◽  
D. DE ANGELIS ◽  
N. J. WELTON ◽  
J. MACLEOD ◽  
...  
Keyword(s):  
Chlamydia Trachomatis ◽  
Dynamic Models ◽  
Credible Interval ◽  
Annual Incidence Rate ◽  
Prevalence Data ◽  
Chlamydia Trachomatis Infection ◽  
Transmission Rates ◽  
Relative Risks ◽  
Using Data

SUMMARYInformation on the incidence of Chlamydia trachomatis (CT) is essential for models of the effectiveness and cost-effectiveness of screening programmes. We developed two independent estimates of CT incidence in women in England: one based on an incidence study, with estimates ‘recalibrated’ to the general population using data on setting-specific relative risks, and allowing for clearance and re-infection during follow-up; the second based on UK prevalence data, and information on the duration of CT infection. The consistency of independent sources of data on incidence, prevalence and duration, validates estimates of these parameters. Pooled estimates of the annual incidence rate in women aged 16–24 and 16–44 years for 2001–2005 using all these data were 0·05 [95% credible interval (CrI) 0·035–0·071] and 0·021 (95% CrI 0·015–0·028), respectively. Although, the estimates apply to England, similar methods could be used in other countries. The methods could be extended to dynamic models to synthesize, and assess the consistency of data on contact and transmission rates.

scholarly journals Comparative Analyses between The Zero-Inertia and Fully Dynamic Models of the Shallow Waters Equations for Unsteady Overland Flow Propagation

2017 ◽  
Author(s):  
Costanza Aricò ◽  
Carmelo Nasello
Keyword(s):  
Overland Flow ◽  
Dynamic Models ◽  
Numerical Models ◽  
Nonlinear Partial Differential Equations ◽  
Computational Effort ◽  
Point Of View ◽  
Shallow Waters ◽  
Hyperbolic Model ◽  
Flow Routing ◽  
Inertial Terms

The shallow water equations are widely applied for the simulation of flow routing in rivers and floodplains, as well as for flood inundation mapping. From a mathematical point of view, they are a hyperbolic system of nonlinear partial differential equations, whose numerical integration is sometimes computationally burdensome. For this reason, the interest of many researchers has been focused on the study of simplified forms of the original set of equations, which requires less computational effort. One of the most commonly applied simplifications consists in neglecting the inertial terms, which changes the hyperbolic model to a parabolic one. The effects of such a choice on the outputs of the simulations of flooding events are controversial and an important topic of debate. In the present paper, two numerical models, recently proposed for the solution of the complete and zero-inertia forms of the shallow waters equations, are applied to several unsteady flow routing scenarios. We simulate synthetic and laboratory studies, starting from very simple geometries and moving towards complex topographies. Analyzing the role of the terms in the momentum equations, we try to understand the effect, on the computed results, of neglecting the inertial terms in the zero-inertia formulation. We analyze the computational costs.

Improvement of the catalytic infrared drying process and quality characteristics of the dried garlic slices by ultrasound-assisted alcohol pretreatment

LWT ◽  
2019 ◽  
Vol 116 ◽  
pp. 108577 ◽  
Author(s):  
Yabin Feng ◽  
Cunshan Zhou ◽  
Abu ElGasim A. Yagoub ◽  
Yanhui Sun ◽  
Patrick Owusu-Ansah ◽  
...  
Keyword(s):  
Quality Characteristics ◽  
Drying Process ◽  
Infrared Drying ◽  
Ultrasound Assisted
Sign in / Sign up

Export Citation Format

Share Document