Improvement of vertical mixing in a raceway pond using internal structures = 레이스웨이 폰드 내에서의 수직 혼합 향상을 위한 구조물의 이용과 그 해석

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Open raceway pond (RWP) is the most common cultivation system for the mass production of microalgae. The algal productivity in the RWP depend on the light intensity. In the RWP, the region near the surface is light zone and the region near the bottom is dark zone. The microalgal cells that remain in the dark region cannot receive sufficient light to grow. This thesis aims to improve vertical mixing so that microalgae can move into the light regions. To enhance mixing efficiency, various designs of internal structure were installed to improve vertical mixing and the fluid flow was compared by experiments and CFD simulations. First, we adopted a suitable structure to decrease of algal settling. The fluid velocity near the bottom increased more than twice compared with inlet velocity. By experiment for microalgae settlement, it was confirmed that less settling occurred in the RWP with the structure than the conventional RWP. Second, another design was proposed to prevent settling and enhance vertical flow. The size and gap of the structure were changed and the flow velocity and vertical velocity increased as the size increased and the gap decreased. Several sets of the largest structures with the small gap were installed along the RWP. As a result, regular vertical flow occurred and average vertical velocity increased by 29 % as compared to the conventional RWP.
Advisors
Kim, Do Hyunresearcher김도현researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2017.2,[vii, 41 p. :]

Keywords

microalgae; open raceway pond; vertical mixing; internal structure; computational fluid dynamics; 미세조류; 레이스웨이 폰드; 수직 혼합; 내부 구조물; 전산유체역학

URI
http://hdl.handle.net/10203/243063
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675568&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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