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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Bio-thermal convection caused by combined effects of swimming of oxytactic bacteria and inclined temperature gradient in a shallow fluid layer
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Bio-thermal convection caused by combined effects of swimming of oxytactic bacteria and inclined temperature gradient in a shallow fluid layer

机译：氧化性细菌游动和倾斜的温度梯度在浅层流体中的综合作用引起的生物热对流

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Purpose - The aim of this paper is to investigate the onset of bio-thermal convection in a shallowrnfluid layer; the convection is thus driven by the combined effect of swimming of oxytacticrnmicroorganisms and inclined temperature gradient.rnDesign/methodology/approach - Linear stability analysis of the basic state is performed; thernnumerical problem is solved using the collocation method.rnFindings - The most interesting outcome of this analysis is the correlation between three Rayleighrnnumbers, two traditional, "thermal" Rayleigh numbers, which are associated with the vertical andrnhorizontal temperature gradients in the fluid layer, and the bioconvection Rayleigh number, which isrnassociated with the density variation induced by the upswimming of microorganisms.rnResearch limitations/implications - Further research should address the application of weaklyrnnonlinear analysis to this problem.rnPractical implications - The increase of the horizontal thermal Rayleigh number stabilizes thernbasic flow. The effect of increasing the horizontal thermal Rayleigh number is to distort the basicrntemperature profile away from the linear one. The increase of the Schmidt number stabilizes the basicrnflow. The increase of the Prandtl number first causes the bioconvection Rayleigh number to decreasernand then to increase.rnOriginality/value - To the best of the authors' knowledge, this is the first research dealing with therneffect of inclined temperature gradient on the stability of bioconvection.
机译：目的-本文的目的是研究在浅层流体中生物热对流的发生。设计/方法/方法-对基本状态进行线性稳定性分析；因此，对流是由氧化性微生物游动和倾斜的温度梯度共同作用而驱动的。 rnFindings-此分析最有趣的结果是，三个瑞利数，两个传统的“热”瑞利数与流体层中的垂直和水平温度梯度相关联，并且生物对流瑞利数，它与微生物上浮引起的密度变化有关。研究局限/意义-进一步的研究应解决弱非线性分析对该问题的应用。增加水平热瑞利数的作用是使基本温度曲线远离线性温度曲线。施密特数的增加稳定了基本流量。 Prandtl数的增加首先导致生物对流Rayleigh数减少，然后增加。原始性/价值-据作者所知，这是第一个研究倾斜温度梯度对生物对流稳定性的影响的研究。

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