Print Email Facebook Twitter Ultrasonic irradiation and its mixing and nucleation consequences Title Ultrasonic irradiation and its mixing and nucleation consequences Author Shawaz, S. Contributor Kramer, H.J.M. (mentor) Faculty Mechanical, Maritime and Materials Engineering Department Process and Energy Programme Intensified Reaction & Separation Systems Date 2012-10-03 Abstract This project aim to determine the macro streaming, the heat input and crystal nucleation induced by ultrasonic irradiation of a vessel containing solutions at different power input and irradiation time. First, experimental determination of the mixing induced by the ultrasound irradiation at different power input was studied using a high speed, high resolution camera. The particle image velocimetry (PIV) technique was used for these studies. The experiments showed that when increasing the power of the ultrasound processor, the velocity increased subsequently. Also, when power was increased, vorticity was increased. After, the heat input given by the sonotrode was studied using high speed camera and liquid crystals which change the color with temperature. The particle image thermometry (PIT) method was used to determined 2D temperature profiles. From the 2D temperature measurement 2D supersaturation profiles was determined. Experiments showed that when temperature increases, supersaturation decreases. The distribution of supersaturation and temperature were assessed at the same moment. Lastly crystal nucleation was performed at power inputs of 50% and 75% and different insonation time from 30 to 120 seconds. The solution used in these experiments was lactose. It was found that when power input increases, the amount of lactose crystals formed was also increasing. With higher power input and increased insonation time, the number of the crystals increased as well as the mean diameters. However there were exception. Above a certain level of insonation time the volume based diameter did not correspondently grow. Subject ultrasoundsupersaturationmacro streamingnucleationParticle Image Velocimetry (PIV)Particle Image Thermometry (PIT)number of crystals To reference this document use: http://resolver.tudelft.nl/uuid:009bff8e-c572-4cb1-ad33-4ffe098c5ee6 Embargo date 2012-10-31 Part of collection Student theses Document type master thesis Rights (c) 2012 Shawaz, S. Files PDF 2517_Shawaz_Final_Draft_S ... r_2012.pdf 1.15 MB Close viewer /islandora/object/uuid:009bff8e-c572-4cb1-ad33-4ffe098c5ee6/datastream/OBJ/view