Delfim-Soares explicit time marching method for modelling of ultrasonic wave in microalgae pre-treatment

International Conference on Sustainable Energy and Green Technology 2018

能源学;生态环境科学

Yen Tey, Wah^1^2 ; Moon Lee, Kiat^3 ; Che Sidik, Nor Azwadi^1 ; Asako, Yutaka^1

Takasago I-Kohza, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Kuala Lumpur, Malaysia^1

Department of Mechanical Engineering, Faculty of Engineering, UCSI University, Kuala Lumpur, Malaysia^2

Department of Chemical and Petroleum Engineering, Faculty of Engineering, UCSI University, Kuala Lumpur, Malaysia^3

关键词: Energy supplies;    Lipid extraction;    Pretreatment methods;    Rayleigh-Plesset equation;    Structural vibrations;    Two-dimensional wave equation;    Ultrasound irradiation;    Wave frequencies;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/268/1/012106/pdf
DOI  :  10.1088/1755-1315/268/1/012106

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Ultrasonic wave is one of the most popular pre-treatment methods of lipid extraction in microalgae, due to its low energy supply requirement, eco-friendliness and excellent cell disruption capability. Although quite some number of experimental works were reported, the numerical modelling of the ultrasonic wave in understanding the working principle of ultrasonic irradiation is limited so far, as to the knowledge of authors. The modelling is required for a more robust pre-treatment optimisation. Therefore, in current work, the numerical model of ultrasonic wave and its cavitation has been developed using the Delfim-Soares explicit time marching method (DSETM), which is proposed in recent years to solve structural vibration problem. The two dimensional wave equation in ultrasonic scale has been solved with the frequency of 20 kHz, 40 kHz and 60 Hz. Moreover, Rayleigh-Plesset equation is solved using the same method too to predict the growth of the radius of bubble due to different initial radius. It is found that higher wave frequency will not improve the speed of cavitation, but instead it can decrease the wavelength to increase the possibility of cavitation process occurrance in enhancing the pre-treatment efficiency.