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Open AccessArticle

Optimization of Tubular Microalgal Photobioreactors with Spiral Ribs under Single-Sided and Double-Sided Illuminations

by Yuling Lei 1, Jing Wang 2 and Jing Wu 2,*
1
China-EU Institute for China and Renewable Energy at Huazhong University of Science & Technology, Wuhan 430074, China
2
School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Processes 2019, 7(9), 619; https://doi.org/10.3390/pr7090619
Received: 21 July 2019 / Revised: 4 September 2019 / Accepted: 9 September 2019 / Published: 12 September 2019
(This article belongs to the Special Issue Energy, Economic and Environment for Industrial Production Processes)
Microalgae can be raw materials for the production of clean energy and have great potential for development. The design of the microalgal photobioreactor (PBR) affects the mixing of the algal suspension and the utilization efficiency of the light energy, thereby affecting the high-efficiency cultivation of the microalgae. In this study, a spiral rib structure was introduced into a tubular microalgal PBR to improve the mixing performance and the light utilization efficiency. The number of spiral ribs, the inclination angle, and the velocity of the algal suspension were optimized for single-sided and double-sided parallel light illuminations with the same total incident light intensity. Next, the optimization results under the two illumination modes were compared. The results showed that the double-sided illumination did not increase the average light/dark (L/D) cycle frequency of the microalgae particles, but it reduced the efficiency of the L/D cycle enhancement. This outcome was analyzed from the point of view of the relative position between the L/D boundary and the vortex in the flow field. Finally, a method to increase the average L/D cycle frequency was proposed and validated. In this method, the relative position between the L/D boundary and the vortex was adjusted so that the L/D boundary passed through the central region of the vortex. This method can also be applied to the design of other types of PBRs to increase the average L/D cycle frequency. View Full-Text
Keywords: tubular microalgal photobioreactor; orthogonal test; light/dark cycle frequency; light/dark boundary; vortex tubular microalgal photobioreactor; orthogonal test; light/dark cycle frequency; light/dark boundary; vortex
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Lei, Y.; Wang, J.; Wu, J. Optimization of Tubular Microalgal Photobioreactors with Spiral Ribs under Single-Sided and Double-Sided Illuminations. Processes 2019, 7, 619.

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