Numerical study of liquid mixing in microalgae-farming tanks with baffles

Chen, Bang-Fuh; Yang, Hung-Kai; Wu, Chih-Hua; Lee, Tzu-Chiang; Chen, Bing

doi:10.1016/j.oceaneng.2018.04.088

Cited by 11 publications

(1 citation statement)

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“…These parameters can be obtained by theoretical models, numerical simulation, and shaking table tests. [ 5–7 ] The frequency [ 8 ] and damping ratio [ 9 ] of TLD with simple geometries, including rectangular and circular‐shaped tanks, can be calculated by the linear wave theory. However, the fluid's sloshing motion in a tank always shows evident nonlinear characteristics.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic characteristics and application of tuned liquid dampers with internal damping devices

Zhang

Xie

2022

Structural Design Tall Build

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The hydrodynamic characteristics of rectangular tanks with internal damping devices, including baffles and paddles, are investigated using shaking table tests excited by colored noise. The complex second-order blind identification method is employed to decouple fluid sloshing responses and to obtain mode shapes. The modal frequency and damping ratio are also identified by the modified Bayesian spectral density approach. The influence of baffle angle, paddle width, liquid depth, and excitation amplitude on the natural frequency and damping ratio of tuned liquid dampers (TLDs) is analyzed. Results show that the natural frequency is reduced due to the added mass produced by the damping devices, and the reduction increases gradually with the increase in the size of the damping devices, indicating that the influence of the added mass should be considered in the design. This result is essentially different from the conclusion of the existing finding that the modal frequency of TLD increases continuously with the increase in the baffle angle. Therefore, the tuning of TLD cannot be realized by rotating the baffles. Moreover, the damping ratio of TLD with paddles shows a nonlinear relationship with the fluid response. The nonlinear empirical model fitted by the test results can predict the damping ratio with high accuracy and can be used in the preliminary design of TLD for the wind-induced vibration control of super-tall buildings.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic characteristics and application of tuned liquid dampers with internal damping devices

Zhang

Xie

2022

Structural Design Tall Build

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Bioreactor for Microalgal Cultivation Systems: Strategy and Development

Yusoff

Nagao

Imaizumi

et al. 2019

Biofuel and Biorefinery Technologies

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Microalgae are important natural resources that can provide food, medicine, energy and various bioproducts for nutraceutical, cosmeceutical and aquaculture industries. Their production rates are superior compared to those of terrestrial crops. However, microalgae biomass production on a large scale is still a challenging problem in terms of economic and ecological viability. Microalgal cultivation system should be designed to maximize production with the least cost. Energy efficient approaches of using light, dynamic mixing to maximize use of carbon dioxide (CO2) and nutrients and selection of highly productive species are the main considerations in designing an efficient photobioreactor. In general, optimized culture conditions and biological responses are the two overarching attributes to be considered for photobioreactor design strategies. Thus, fundamental aspects of microalgae growth, such as availability of suitable light, CO2 and nutrients to each growing cell, suitable environmental parameters (including temperature and pH) and efficient removal of oxygen which otherwise would negatively impact the algal growth, should be integrated into the photobioreactor design and function. Innovations should be strategized to fully exploit the wastewaters, flue-gas, waves or solar energy to drive large outdoor microalgae cultivation systems. Cultured species should be carefully selected to match the most suitable growth parameters in different reactor systems. Factors that would decrease production such as photoinhibition, self-shading and phosphate flocculation should be nullified using appropriate technical approaches such as flashing light innovation, selective light spectrum, light-CO2 synergy and mixing dynamics. Use of predictive mathematical modelling and adoption of new technologies in novel photobioreactor design will not only increase the photosynthetic and growth rates but will also enhance the quality of microalgae composition. Optimizing the use of natural resources and industrial wastes that would otherwise harm the environment should be given emphasis in strategizing the photobioreactor mass production. To date, more research and innovation are needed since scalability and economics of microalgae cultivation using photobioreactors remain the challenges to be overcome for large-scale microalgae production.

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