Thesis

Development of an experimental arrangement for measurement of evaporation through measurement of changes in flowrate

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Awarding institution
  • University of Strathclyde
Date of award
  • 2013
Thesis identifier
  • T13377
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Abstract
  • A Vaporiser is a device that delivers a required concentration of vapour into a gas stream. There are different types of vaporisers and also a range of methods for the measurement of evaporation rate. The existing measurement techniques include change in volume, mass and concentration. This work is focused to measure the evaporation rate of vapours (ethanol) into a gas stream (nitrogen) through a new developed experimental method and also using the theoretical method. In this work, a diffusion cell is developed at a small scale which would give a flow of ethanol vapours in a controlled manner. A microplant is also developed in a twin sided mode which consists of a differential pressure transducer (DPT), resistance tubing and empty tubing to measure extremely small changes in flow rate. The diffusion cell is then integrated with the microplant technology in which case the vapours (ethanol) are added from the diffusion cell into the main stream of gas (nitrogen). When vapours (ethanol) are added into main stream of nitrogen gas this resulted a step increase in the differential pressure transducer signal which is due to an increase in the resulting flowrate. The evaporation rate is then calculated from this change in flowrate. These results are then compared with the results achieved from theoretical method. The results achieved from theoretical method indicated that the evaporation rate of ethanol is 0.052ml/min which is 3.2 times greater than the experimental diffusion rate (0.0163ml/min). This shows that diffusion rate in the experimental method is extremely low this is due to the reason that a conical flask and small diameter diffusion tube were used in the experimental setup which was not producing sufficient and continuous flow of vapours (ethanol). The evaporation rate in the experimental method can be further increased by applying design changes to the current diffusion tube i.e. increasing its diameter and reducing the distance from the liquid surface and the main stream of nitrogen gas.
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  • Strathclyde theses - ask staff. Thesis no. : T13377
DOI
Date Created
  • 2013
Former identifier
  • 989104

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