Hydrodynamic Behavior of Suspensions of Polar Particles

Orozco, Luis Antonio Dávalos; Castillo, L. F. del

doi:10.1081/e-escs3-120021916

Cited by 2 publications

(3 citation statements)

References 231 publications

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“…Here, the shooting method [61] is used to solve the eigenvalue problem posed by the system of Eqs. (20) and (21) subjected to the boundary condition Eq. (22).…”

Section: Numerical Computations By a Shooting Methodsmentioning

confidence: 99%

“…(23-26) and the mentioned scalings in Eqs. (20) and (21) with boundary condition Eq. (22), we obtain the following systems of equations at different orders.…”

Section: Asymptotic Analysismentioning

confidence: 99%

“…According to the model of Childress et al [19], the critical wavenumber at the onset of the instability is always zero. In ordinary particles and colloidal suspensions, the internal degrees of freedom like the internal rotation or spin are important under some geometrical and physical conditions [21,22]. The case of a suspension of microorganisms is not an exception.…”

Section: Introductionmentioning

confidence: 99%

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Bioconvective Linear Stability of Gravitactic Microorganisms

Pérez-Reyes¹,

Dávalos‐Orozco²

2019

Heat and Mass Transfer - Advances in Science and Technology Applications

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Interesting results on the linear bioconvective instability of a suspension of gravitactic microorganisms have been calculated. The hydrodynamic stability is characterized by dimensionless parameters such as the bioconvection Rayleigh number R, the gyrotaxis number G, the motility of microorganisms d, and the wavenumber k of the perturbation. Analytical and numerical solutions are calculated. The analytical one is an asymptotic solution for small wavenumbers (and for any motility number) which agrees very well with the numerical solutions. Two numerical methods are used for the sake of comparison. They are a shooting method and a Galerkin method. Marginal curves of R against k for fixed values of d and G are presented along with curves corresponding to the variation of the critical values of R c and k c. Moreover, those critical values are compared with the experimental data reported in the literature, where the gyrotactic algae Chlamydomonas nivalis is the suspended microorganism. It is shown that the agreement between the present theoretical results and the experiments is very good.

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“…Here, the shooting method [61] is used to solve the eigenvalue problem posed by the system of Eqs. (20) and (21) subjected to the boundary condition Eq. (22).…”

Section: Numerical Computations By a Shooting Methodsmentioning

confidence: 99%

“…(23-26) and the mentioned scalings in Eqs. (20) and (21) with boundary condition Eq. (22), we obtain the following systems of equations at different orders.…”

Section: Asymptotic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bioconvective Linear Stability of Gravitactic Microorganisms

Pérez-Reyes¹,

Dávalos‐Orozco²

2019

Heat and Mass Transfer - Advances in Science and Technology Applications

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Review on Nanofluids: Preparation, Properties, Stability, and Thermal Performance Augmentation in Heat Transfer Applications

Rahman,

Hasnain,

Pandey

et al. 2024

ACS Omega

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Nanoparticles play a crucial role in enhancing the thermal and rheological properties of nanofluids, making them a valuable option for increasing the efficiency of heat exchangers. This research explores how nanoparticle characteristics, such as concentration, size, and shape, impact the properties of nanofluids. Nanofluids' thermophysical properties and flow characteristics are essential in determining heat transfer efficiency and pressure loss. Nanoparticles with high thermal conductivity, such as metallic oxides like MgO, TiO 2 , and ZnO, can significantly improve the heat transfer efficiency by around 30% compared to the base fluid. The stability of nanofluids plays a crucial role in their usability. Various methods, such as adding surfactants, using ultrasonic mixing, and controlling pH, have been employed to enhance the stability of nanofluids. The desired thermophysical properties can be achieved by utilizing nanofluids to enhance the system's heat transfer efficiency. Modifying the size and shape of nanoparticles also considerably improves thermal conductivity, affecting nanofluid viscosity and density. Equations for determining heat transfer rate and pressure drop in a double-pipe heat exchanger are discussed in this review, emphasizing the significance of nanofluid thermal conductivity in influencing heat transfer efficiency and nanofluid viscosity in impacting pressure loss. This Review identifies a trend indicating that increasing nanoparticle volume concentration can enhance heat transfer efficiency to a certain extent. However, surpassing the optimal concentration can reduce Brownian motions due to higher viscosity and density. This Review offers a viable solution for enhancing the thermal performance of heat transfer equipment and serves as a fundamental resource for applying nanofluids in heat transfer applications.

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Hydrodynamic Behavior of Suspensions of Polar Particles

Cited by 2 publications

References 231 publications

Bioconvective Linear Stability of Gravitactic Microorganisms

Bioconvective Linear Stability of Gravitactic Microorganisms

Review on Nanofluids: Preparation, Properties, Stability, and Thermal Performance Augmentation in Heat Transfer Applications

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