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Investigations in an external-loop airlift photobioreactor .

A two-phase gas-liquid flow was maintained with high mixing. Furthermore, a liquid-falling tube was used to enhance the liquid circulation velocity as the tube separated the gas-liquid phases.

Altay Yuzeir – Rhine-Waal University – Kleve, Nordrhein .

• The goal of this project is to calculate the pressure loss inside a thin tube (mm dimension) in a photobioreactor (PBR). The flow pattern inside the tube contain two different heterogeneous liquids and one gaseous phase in-between, entering the tube in determined portions one after another.

Photobioreactor - LinkedIn SlideShare

Dec 06, 2017 · Typically PBRs consist of four-phase systems: cell as solid phase, growth medium as liquid phase, gaseous phase, and light radiation field. When considering the design of PBRs, issues such as gaseous exchange, mixing pattern, contamination control, light supply efficiency, building material, and geometrical configuration must be considered.

Experimental study and numerical modeling of CO2 bio .

in the photobioreactor, a mathematical model is developed and presented in this section. The model was developed by combining the mass balance equations for gas and liquid phase in photobioreactor, the growth rate kinetics and algebraic equations describing the equilibrium of compounds in the culture media. 3.1 Mass balance model

Closed Photobioreactor System For Continued Daily In Situ .

May 02, 2013 · The term "liquid phase" includes both the liquid in the culture, and the liquid as a condensate, . corresponding to the "evaporated then condensed" liquid. Photobioreactor Apparatus #5 and Photobioreactor Apparatus #6 are two example photobioreactors which embody the invention illustrate the enrichment or enhanced ethanol .

Design of a Cylindrical Photobioreactor with Central .

space. Therefore, a photobioreactor with concentric tubes was modelled to verify the circulation of the culture medium. Computational Methods: The physics interface used was Turbulent Bubbly Flow with low gas concentration approximation and k-ε turbulence model. Fluid properties were the default for water (liquid phase) and air (gas phase).

Investigation of turbulent multiphase flows in a flat .

flows in the gas phase and liquid phase in an algae photobioreactor. Dr. Hui Hu and his post doc, Dr. Zifeng Yang, both of the aerospace engineering department, provided assistance with PIV measurements of the bioreactor. Dr. Zhiyou Wen, of the Food Science and Human

Surfactant selection for a liquid foam‐bed photobioreactor .

A novel liquid foam‐bed photobioreactor has been shown to hold potential as an innovative technology for microalgae production. In this study, a foam stabilizing agent has been selected which fits the requirements of use in a liquid foam‐bed photobioreactor.

Photobioreactor to cultivate and reproduce phototrophic .

The photobioreactor for the cultivation and reproduction of phototrophic organisms in liquid phase by reacting with gaseous, solid and/or liquid additives during illumination with sun- and/or artificial light for the extraction of biomass (5) and/or its metabolic products and the utilization of surplus light energy, comprises a device for controlling light transparency and heat input, and semi .

(PDF) Membrane Photobioreactor as a Device to Increase CO2 .

liquid- membrane interface; and (3) transfer of the gases into the liquid bulk phase. This can be illustrated as shown in Fig. 14.1 . Unlike a con ventional membrane, the main driving force for a .

Aeration in a Photobioreactor - Oilgae

The photobioreactor is designed without moving parts and equipped with two different spargers operated in dual sparging mode. . from gas phase to liquid phase five fold relative to conventional sparging. The dual-sparger system has the potential to minimize the required aeration rates for

Potential of a liquid foam-bed photobioreactor for .

highlighted in several studies [1–3]. A liquid foam-bed photobioreactor is an alternative photobioreactor concept to existing liquid-phase pho-tobioreactors [4]. This reactor configuration was developed in order to reduce the energy requirements related to harvesting and gas supply. The reduction in harvesting costs is based on increased .

MODELING ALGAL CULTIVATION IN A BUBBLE COLUMN .

The dispersed phase bubble populations were modeled with 10 size classes ranging from 0.1 to 12 mm. 3. RESULTS AND DISCUSSION Some results from the CFD simulations are presented in Figure 3. Figure 3. Liquid phase fractions and liquid velocities in the bubble column at superficial gas velocities 0.01 m/s on left, 0.025 m/s on right.

Microalgae production in liquid foam-bed photobioreactors .

In order to separate the gas phase from the liquid phase containing algae, different methods for foam break-up will be tested, which are either based on self-drainage of the foam or based on the utilisation of foam breaking devices. Next, the performance of the foam-bed photobioreactor will be investigated, described and possibly further improved.

Microalgae Production in Liquid Foam-Beds

gaseous phase is separated from the liquid phase. Alternatively, the foam is allowed to rise to that high levels that the liquid films drain by itself and the foam breaks up spontaneously. Gas distributor creating small gas bubbles Rising foam-bed The liquid foam of a photobioreactor .

Fiber-optic differential absorption sensor for accurately .

Jan 10, 2015 · A fiber-optic differential absorption sensor was developed to accurately monitor biomass growth in a photobioreactor. The prepared sensor consists of two probes: the sensor and the reference. The sensor probe was employed to monitor the biomass and changes in the liquid-phase concentration in .

An experimental investigation on the multiphase flows and .

sorokiniana in turbulently mixing short light-path photobioreactor. Biotechnol Prog 26:687–696 Lindken R, Merzkirch W (2000) Velocity measurements of liquid and gaseous phase for a system of bubbles rising in water. Exp Fluids 209:S194–S201 Liu Z, Zheng Y, Jia L, Zhang Q (2005) Study of bubble induced flow structure using PIV.

XPERIMENTAL EVALUATION OF A HELICAL LABORATORY .

coefficients in the liquid phase and their dependency on the liquid circulation rate and gas inflow rate were determined. The experiments were performed in tap water and then in a real three-phase cultiva- . Keywords: photobioreactor, hydrodynamics, mass transfer, microalgae, thermophilic cyanobacteria 1. INTRODUCTION

An experimental investigation of the multiphase flows in a .

Algal biomass is a promising feedstock for biofuels production, with photobioreactors being one of the major cultivation systems for algal cells. Light absorption, fluid dynamics, and algal metabolism are three key factors in determining the overall performance of a photobioreactor. The behavior of the multiphase flow (i.e., liquid phase - water, gas phase - CO2 and O2

CFD simulation of multiphase (liquid–solid–gas) flow in an .

As there are fewer hydraulic restrictions to the liquid phase in the riser, a large amount of energy is dissipated by gas–liquid interactions. In the downcomer region, the gas phase is almost nonexistent, and bubble collisions are almost nonexistent as well.

(PDF) Photobioreactor Design and Fluid Dynamics

Photobioreactor design is a subject of great relevance for the attainment of a sustained development in modern technology,and has also considerable interest from the basic scientific and .

An experimental investigation on the multiphase flows and .

sorokiniana in turbulently mixing short light-path photobioreactor. Biotechnol Prog 26:687–696 Lindken R, Merzkirch W (2000) Velocity measurements of liquid and gaseous phase for a system of bubbles rising in water. Exp Fluids 209:S194–S201 Liu Z, Zheng Y, Jia L, Zhang Q (2005) Study of bubble induced flow structure using PIV.

(PDF) Tubular Photobioreactors

two-phase fl o w PBR, the whole length of the piping between inlet and outlet was the site of mass transfer between the circulating gas and liquid. Compared to similar

An Experimental Investigation on the Multiphase Flows in a .

The turbulent mixing of multiphase flows inside the photobioreactor (i.e., liquid phase — water, gas phase — CO 2 and O 2, and solid phase — algae cells) is the core connecting the three key factors together. In the present study, a comprehensive experimental investigation is conducted to quantify the effects of turbulent mixing in .

Comparison of four outdoor pilot-scale photobioreactors .

Dec 18, 2015 · The horizontal tubular photobioreactor consists of three loops of 80 m each (Fig. 4) connected via a manifold to a bubble column used for oxygen removal, temperature control, nutrient and antifoam addition (Silicone RE20 Snapsil, BRB international, The Netherlands). The horizontal photobioreactor was operated at a liquid velocity of 0.45 m s −1.

Bubble Formation and Bubble Rise Velocity in Gas−Liquid .

May 04, 2005 · Stratification of the Radiation Field Inside a Photobioreactor During Microalgae Growth. Photochemistry and Photobiology 2013, 89 (5), 1127-1134. DOI: 10.1111/php.12095. Amol A. Kulkarni, Vivek V. Ranade. Direct contact heat transfer via injecting volatile liquid in a hot liquid pool: Generation and motion of bubbles.

Iowa State photobioreactor research could speed biofuels .

Jun 28, 2013 · The first challenge of the research is to accurately describe the multi-phase flow occurring in a photobioreactor. "You have a liquid growth medium circulating through the system," explained Olsen. "In addition to the turbulent fluid flow, you have gas bubbles that are reacting to the turbulence and causing their own turbulence.

Photobioreactor Suppliers, Manufacturer, Distributor .

Liquid Phase Photochemical Photobioreactor Outside-illuminated Photo Reactor Price. Country/Region: China. Main Products: glass reactor,rotary evaporator system,photochemical reactor system,freeze dryer,spray dryer. Total Revenue: Above US 100 Million. Top 3 Markets:

Tubular photobioreactor design for algal cultures

I irradiance on photobioreactor surface ( Em−2 s−1) o I irradiance in the water pool ( Em−2 s−1) w k volumetric gas–liquid mass transfer coefficient (s−1) L a L k L gas–liquid mass transfer coefficient (m s−1) K extinction coefficient for biomass (m2 g−1) a K B .

Fiber Bragg Grating with Polyimide–Silica Hybrid Membrane .

Aug 28, 2014 · A microstructured fiber Bragg grating (MSFBG) was created to accurately and simultaneously monitor the cell growth of photosynthetic bacteria (PSB) Rhodopseudomonas palustris CQK 01 and the temperature in a photobioreactor. The proposed sensor was made from an FBG unit that was separated into three regions, an unperturbed region, and two etched regions with smooth .