Countercurrent transfer processes in the non-steady state

1954 ◽  
Vol 225 (1161) ◽  
pp. 226-244 ◽  
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Heat Exchanger ◽  
General Solution ◽  
Wide Class ◽  
Distillation Process ◽  
Batch Distillation ◽  
Transfer Processes ◽  
Mass And Heat Transfer ◽  
Continuous Distillation

Countercurrent mass and heat-transfer operations are analyzed mathematically, taking into account column capacity, and a general solution is obtained which enables the course of non-steady conditions to be followed quantitatively for a wide class of processes. Absorption and extraction, continuous distillation and batch distillation, are treated in detail, and illustrative examples are provided of the behaviour of a typical heat exchanger and of a typical batch distillation process.

Mathematical modeling of heat transfer inside a biogas plant

2020 ◽  
Vol 6 ◽  
pp. 40-43
Author(s):  
Amur Fiapshev ◽  
Marat Khamokov ◽  
Olesya Kilchukova ◽  
Batyr Fiapshev
Keyword(s):  
Mathematical Modeling ◽  
Heat Transfer ◽  
Heat Exchanger ◽  
Biogas Plant ◽  
Plant Performance ◽  
Temperature Level ◽  
Research Results ◽  
Transfer Processes

The main purpose of this project was to simulate heat transfer processes inside a biogas plant. The unique design of the suggested biogas plant incorporates a heat exchanger mixer as one combined part. This allowed more even biomass warming and keeping the required temperature level all over the tank to optimize the overall biogas processing in the plant. The research results show how major biogas plant parameters affect the plant performance.

Cross-current transfer processes in the non-steady state

1963 ◽  
Vol 272 (1349) ◽  
pp. 241-269 ◽  
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Steady States ◽  
The State ◽  
Current Transfer ◽  
Transfer Processes ◽  
Inlet Stream ◽  
Cross Current ◽  
Current Heat

The steady and non-steady states of cross-current transfer processes are analyzed mathematically for conditions where there is no mixing in either stream. Solutions are obtained which enable non-steady conditions to be followed quantitatively, whether they are caused by continuous or discontinuous regular or by random variations in the state of an inlet stream. As an illustrative example the response of a cross-current heat exchanger to a stepchange in the temperature of one of the inlet streams is calculated.

Changed Heat and Mass Transfer Evaluation of a Gas-to-Gas Type Membrane Humidifier by Mass Collection

2010 ◽  
Author(s):  
ByungJun Kim ◽  
SangSeok Yu ◽  
YoungDuk Lee ◽  
KookYoung Ahn
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Steady State ◽  
Heat And Mass Transfer ◽  
Humidity Sensor ◽  
Transient State ◽  
Air Flow Rate ◽  
Dry Air ◽  
Mass And Heat Transfer ◽  
Mass Collection

In this paper, a technique of the humidity measurement is developed to identify the performance of membrane humidifier. The technique is designed to measure the performance of membrane humidifier during steady state and transient state. In particular, the measurement technique is very useful to understand dynamic behavior of humidifier because the response of commercial humidity sensor is too slow to capture the transient response of mass and heat transfer through the membrane. Accordingly, the heat and mass transfer characteristics of membrane humidifier are figured out with the experimental analysis. The parameters used in experiment are dry air pressure, humid air temperature and dry air flow rate.

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