Particle dynamics and particle heat and mass transfer in thermal plasmas. Part I. The motion of a single particle without thermal effects

1985 ◽  
Vol 5 (3) ◽  
pp. 211-237 ◽  
Author(s):  
E. Pfender ◽  
Y. C. Lee
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Single Particle ◽  
Thermal Effects ◽  
Particle Dynamics ◽  
Thermal Plasmas

scholarly journals Pulsed Multiphase Flows—Numerical Investigation of Particle Dynamics in Pulsating Gas–Solid Flows at Elevated Temperatures

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 815
Author(s):  
Arne Teiwes ◽  
Maksym Dosta ◽  
Michael Jacob ◽  
Stefan Heinrich
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Multiphase Flows ◽  
Gas Flow ◽  
Elevated Temperatures ◽  
Process Intensification ◽  
Particle Dynamics ◽  
Transport Processes ◽  
Pulse Combustion ◽  
New Processing

Although the benefits of pulsating multiphase flows and the concomitant opportunity to intensify heat and mass transfer processes for, e.g., drying, extraction or chemical reactions have been known for some time, the industrial implementation is still limited. This is particularly due to the lack of understanding of basic influencing factors, such as amplitude and frequency of the pulsating flow and the resulting particle dynamics. The pulsation generates oscillation of velocity, pressure, and temperature, intensifying the heat and mass transfer by a factor of up to five compared to stationary gas flow. With the goal of process intensification and targeted control of sub-processes or even the development of completely new processing routes for the formation, drying or conversion of particulate solids in pulsating gas flows as utilized in, e.g., pulse combustion drying or pulse combustion spray pyrolysis, the basic understanding of occurring transport processes is becoming more and more important. In the presented study, the influence of gas-flow conditions and particle properties on particle dynamics as well as particle residence time and the resulting heat and mass transfer in pulsating gas–solid flows are investigated.

A Steady-State Model of a Floating Ring Bearing, Including Thermal Effects

1992 ◽  
Vol 114 (1) ◽  
pp. 141-149 ◽  
Author(s):  
D. M. Clarke ◽  
C. Fall ◽  
G. N. Hayden ◽  
T. S. Wilkinson
Keyword(s):  
Mass Transfer ◽  
Steady State ◽  
Numerical Solution ◽  
Heat And Mass Transfer ◽  
Thermal Effects ◽  
State Model ◽  
Steady State Model ◽  
Lubricant Films ◽  
Energy Equations

A steady-state model of a conventional floating ring bearing is presented, specifically, to assess the feasibility of its use in the power generating industry. It necessitates the numerical solution of the Reynolds and energy equations for both inner and outer lubricant films. Oil recirculation and heat and mass transfer between the films are included. For the application considered, the oil temperatures and eccentricity ratios encountered are not excessive.

Heat and mass transfer analysis of a high-pressure TGA with defined gas flow for single-particle studies

2021 ◽  
Vol 411 ◽  
pp. 128503
Author(s):  
Fengbo An ◽  
Felix Küster ◽  
Roland Ackermann ◽  
Stefan Guhl ◽  
Andreas Richter
Keyword(s):  
Mass Transfer ◽  
High Pressure ◽  
Heat And Mass Transfer ◽  
Single Particle ◽  
Gas Flow

Research on thermophysical characteristics of food products

2021 ◽  
Vol 12 (3) ◽  
Author(s):  
Z. A. Burova ◽  
◽  
S.O. Ivanov ◽  
T.O. Roman ◽  
V. P. Vasyliv ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Thermal Effects ◽  
Food Products ◽  
Thermophysical Characteristics ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Wide Range

Healthy diet is one of the most important elements in maintaining health and strengthening the nation's immunity, an essential condition for achieving active longevity of present and future generations. Inventing new ingredients and creation of food products based on them, development of new and improvement of existing technologies requires reliable information about the basic thermophysical characteristics of raw materials and biological substances to calculate and optimize heat and mass transfer processes during processing and production. Modern science offers a wide range of studies on the thermodynamic and heat and mass transfer process parameters, determination of the thermophysical characteristics of new substances and products using metrologically certified devices and information measuring systems. The main problem in the study of materials of biological origin is their inhomogeneity and sample structure heterogeneity. Measuring the effective thermal conductivity coefficient of bulk materials and cereals should be carried out in a stationary thermal mode on the device for determination of the thermophysical properties of materials and thermal effects, which implements a symmetrical scheme of the thermometric method of measurement using heat flow and temperature sensors. Using four measuring cells allows synchronous comparative analysis of several samples, and the rotary clamping mechanism helps to minimize contact resistance. The developed technique for measuring the coefficient of effective thermal conductivity takes into account the characteristics of bulk food products and significantly increases the accuracy of their thermal conductivity determination by introducing a correction for the contact resistance of the wall layer. The possibility of long-term observations allows to study thermolabile materials, analyze the thermal effects in the samples, to estimate the volumetric and integral heat dissipation. Calorimetric studies of a wide range of biological materials and substances can be performed with sufficient accuracy by the STA system, which implements step-by-step scanning and synchronous thermal analysis methods to determine the specific heat capacity and heat of evaporation, the ratio of free and bound moisture in heterogeneous materials. These characteristics are integral parameters in the study of the kinetics of heat and mass transfer processes, including drying, for the calculation and design of process equipment. Research on the thermophysical characteristics of heterogeneous materials and substances will optimize production processes and further develop technologies in the food, biotechnology, and processing industries.

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