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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Effect of Fractal-Like Aggregation on Radiative Properties and Specific Growth Rate of Chlorella

Zhen-Zong He
Harbin Institute of Technology

Hong Qi
School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001, PR China

Qin Chen
Harbin Institute of Technology

Ya-Tao Ren
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, P. R. China

Li-Ming Ruan
School of Energy Science and Engineering, Harbin Institute of Technology 92 West Dazhi Street, Harbin, Heilongjiang, 150001, P.R. China

DOI: 10.1615/IHTC15.rad.009531
pages 7281-7294

KEY WORDS: Aggregation, Fractal, Radiative properties, Chlorella, Monod model, Light transfer, Specific growth rate


Chlorella is an attractive potential food source, for its particular richness in protein and other essential nutrients. In this study, the Generalized Multiparticle Mie-solution (GMM) method is employed to perform extensive computations of radiative properties of fractal-like Chlorella cells aggregation in random orientation at wavelength 442 nm. The effects of fractal dimension, the prefactor, the monomer radius and the number of monomers on the radiative properties are investigated thoroughly. For comparing the radiative properties of the Chlorella clusters with those of the scattering monomers (ignoring the electromagnetic interaction between the monomers), the relative radiative properties are employed, and the results show that the optical cross sections and single-scattering albedo of the clusters are smaller than those of the scattering monomers. Moreover, if increasing the fractal dimension, the values of monomer radius and the number of monomers, the optical cross sections and single scattering albedo tend to be smaller. Based on the calculated radiative properties of Chlorella clusters, the Finite Volume Method (FVM) is applied to investigate light transfer in the photobioreactors containing Chlorella clusters and the scattering monomers, respectively. The results demonstrate that the light attenuates slowly in the photobioreactor which contains the clusters, compared with that includes the independent scattering monomers. Based on the Monod model, the specific growth rate in the photobioreactors is studied. The investigation reveals that the aggregation will inhibit the growth of Chlorella cells, so the Chlorella is recommended to be cultivated as dispersed as possible for larger production rate.

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