Universiti Teknologi Malaysia Institutional Repository

A computational and experimental study on acoustic pressure for ultrasonically formed oil-in-water emulsion

Tiong, T. Joyce and Chu, Jin Kiat and Lim, Li Yan and Tan, Khang Wei and Yeow, Hong Yap and Aslid, Umi Aisah (2019) A computational and experimental study on acoustic pressure for ultrasonically formed oil-in-water emulsion. Ultrasonics Sonochemistry, 56 . pp. 46-54. ISSN 1350-4177

[img]
Preview
PDF
1MB

Official URL: http://dx.doi.org/10.1016/j.ultsonch.2019.03.026

Abstract

In the field of ultrasonic emulsification, the formation and cavitation collapse is one major factor contributing to the formation of micro- and nano-sized emulsion droplets. In this work, a series of experiments were conducted to examine the effects of varying the ultrasonic horn's position to the sizes of emulsion droplets formed, in an attempt to compare the influence of the simulated acoustic pressure fields to the experimental results. Results showed that the intensity of the acoustic pressure played a vital role in the formation of smaller emulsion droplets. Larger areas with acoustic pressure above the cavitation threshold in the water phase have resulted in the formation of smaller emulsion droplets ca. 250 nm and with polydispersity index of 0.2–0.3. Placing the ultrasonic horn at the oil-water interface has hindered the formation of small emulsion droplets, due to the transfer of energy to overcome the interfacial surface tension of oil and water, resulting in a slight reduction in the maximum acoustic pressure, as well as the total area with acoustic pressures above the cavitation threshold. This work has demonstrated the influence of the position of the ultrasonic horn in the oil and water system on the final emulsion droplets formed and can conclude the importance of generating acoustic pressure above the cavitation threshold to achieve small and stable oil-in-water emulsion.

Item Type:Article
Uncontrolled Keywords:experimental study, oil-in-water, particle size
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:89098
Deposited By: Yanti Mohd Shah
Deposited On:26 Jan 2021 16:44
Last Modified:26 Jan 2021 16:44

Repository Staff Only: item control page