Determining the critical condition for turbulent transition in a full-developed annulus flow

Dou, Hua-Shu; Khoo, Boo Cheong; Tsai, Her Mann

doi:10.1016/j.petrol.2010.05.003

Cited by 42 publications

(28 citation statements)

References 34 publications

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“…For the present experiments, Equation (6) It is noted that the above Reynolds number Re LFC is considerably lower than that expected for transition to turbulence in the film in an annulus flow regime in the absence of a turbulent gas core flow. In that flow case, the theoretical analysis of Dou et al (2010) suggests a critical liquid Re L (equivalent to that employed in this paper) of around 1330, based on the measured mean film thicknesses in our flows. The predictions of Dou et al (2010) have shown good agreement with experimental data taken in annulus flows by Hank and Bonner (1971).…”

Section: Temporal Film Thickness Developmentmentioning

confidence: 71%

“…In that flow case, the theoretical analysis of Dou et al (2010) suggests a critical liquid Re L (equivalent to that employed in this paper) of around 1330, based on the measured mean film thicknesses in our flows. The predictions of Dou et al (2010) have shown good agreement with experimental data taken in annulus flows by Hank and Bonner (1971). On the other hand, the Reynolds number Re LFC = 450 is close to the critical value of 380 suggested by Azzopardi (1997) and Alekseenko et al (2009), based on the liquid phase and the geometry of the experiments discussed in the present paper.…”

Section: Temporal Film Thickness Developmentmentioning

confidence: 71%

See 1 more Smart Citation

Disturbance wave development in two-phase gas–liquid upwards vertical annular flow

Zhao

Markides

Matar

et al. 2013

International Journal of Multiphase Flow

149

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Section: Temporal Film Thickness Developmentmentioning

confidence: 71%

Section: Temporal Film Thickness Developmentmentioning

confidence: 71%

Disturbance wave development in two-phase gas–liquid upwards vertical annular flow

Zhao

Markides

Matar

et al. 2013

International Journal of Multiphase Flow

149

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“…The water flow is turbulent with a Reynolds number of Re ≈ 5800 > Re c ≈ 2400 according to [40] . The heat transfer coefficient h turb for a turbulent flow in an annulus obtained by a correlation [41] :…”

Section: Cbb Configurationmentioning

confidence: 99%

Joint experimental and numerical study of the influence of flame holder temperature on the stabilization of a laminar methane flame on a cylinder

Miguel-Brebion

Mejía

Xavier

et al. 2016

Combustion and Flame

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. a b s t r a c tThe mechanisms controlling laminar flame anchoring on a cylindrical bluff-body are investigated using DNS and experiments. Two configurations are examined: water-cooled and uncooled steel cylinders. Comparisons between experimental measurements and DNS show good agreement for the flame root locations in the two configurations. In the cooled case, the flame holder is maintained at about 300 K and the flame is stabilized in the wake of the cylinder, in the recirculation zone formed by the products of combustion. In the uncooled case, the bluff-body reaches a steady temperature of about 700 K in both experiment and DNS and the flame is stabilized closer to it. The fully coupled DNS of the flame and the temperature field in the bluff-body also shows that capturing the correct radiative heat transfer from the bluff-body is a key ingredient to reproduce experimental results.

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“…For pipe flow, a new equation is proposed in this study based on the energy gradient theory, i.e., using Eq. (12) , the minimum critical value of Re for turbulent transition can be predicted, as in [33]. In this process, the value of K in the flow field can be calculated by analytical solution or numerical solution.…”

Section: Empirical Methodsmentioning

confidence: 99%

“…The critical flow rate and critical Reynolds number are given for various radius ratios. Then, the analytical results are compared with the experiments in the literature [33]. Finally, the implication of the result is discussed in terms of the drag reduction and mixing as well as heat transfer in practical industrial applications of various fluid delivery devices.…”

Section: Annulus Flowmentioning

confidence: 99%

Theory and Prediction of Turbulent Transition

Dou

Khoo

2011

International Journal of Fluid Machinery and Systems

Self Cite

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We have proposed a new approach based on energy gradient concept for the study of flow instability and turbulent transition in parallel flows in our previous works. It was shown that the disturbance amplitude required for turbulent transition is inversely proportional to Re, which is in agreement with the experiments for imposed transverse disturbance. In present study, the energy gradient theory is extended to the generalized curved flows which have much application in turbomachinery and other fluid delivery devices. Within the frame of the new theory, basic theorems for flow instability in general cases are provided in details. Examples of applications of the theory are given from our previous studies which show comparison of the theory with available experimental data. It is shown that excellent agreement has been achieved for several configurations. Finally, various prediction methods for turbulent transition are reviewed and commented.

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Determining the critical condition for turbulent transition in a full-developed annulus flow

Cited by 42 publications

References 34 publications

Disturbance wave development in two-phase gas–liquid upwards vertical annular flow

Disturbance wave development in two-phase gas–liquid upwards vertical annular flow

Joint experimental and numerical study of the influence of flame holder temperature on the stabilization of a laminar methane flame on a cylinder

Theory and Prediction of Turbulent Transition

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