Analysis of the heat transfer coefficient in a turbulent particle pipe flow

Ávila, Raúl; Cervantes, J.

doi:10.1016/0017-9310(94)00321-l

Cited by 47 publications

(27 citation statements)

References 15 publications

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“…The majority of these investigations focused on the heat transfer between the two phases or the modulation of heat transfer efficiency at the solid walls [24][25][26][27]. Some research results showed that the heat transfer rate increases with the addition of particles at high mass loadings, whereas at low mass loadings, the heat transfer rate decreases [28]. Furthermore, while large particles increase the heat transfer coefficient, small particles have a negligible impact on the heat transfer coefficient or even decrease it [29][30][31].…”

Section: Introductionmentioning

confidence: 95%

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

et al. 2017

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The dynamic and thermal performance of particleladen turbulent flow is investigated via direction numerical simulation combined with the Lagrangian point-particle tracking under the condition of two-way coupling, with a focus on the contributions of particle feedback effect to momentum and heat transfer of turbulence. We take into account the effects of particles on flow drag and Nusselt number and explore the possibility of drag reduction in conjunction with heat transfer enhancement in particle-laden turbulent flows. The effects of particles on momentum and heat transfer are analyzed, and the possibility of drag reduction in conjunction with heat transfer enhancement for the prototypical case of particle-laden turbulent channel flows is addressed. We present results of turbulence modification and heat transfer in turbulent particle-laden channel flow, which shows the heat transfer reduction when large inertial particles with low specific heat capacity are added to the flow. However, we also found an enhancement of the heat transfer and a small reduction of the flow drag when particles with high specific heat capacity are involved. The present results show that particles, which are active agents, interact not only with the velocity field, but also the temperature field and can cause a dissimilarity in momentum and heat transport. This demonstrates that the possibility to increase heat transfer and B Yuhong Dong suppress friction drag can be achieved with addition of particles with different thermal properties.

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Section: Introductionmentioning

confidence: 95%

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

et al. 2017

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“…The average heat transfer coefficient is also a function of particle size, particle loading ratio, and suspension Reynolds number, which is a measure of the particles' residence time in the heated pipe. Avila and Cervantes (1995) verified that for a vertical pipe with constant wall temperature large particles (200 mm) do not increase heat transfer, whereas small particles (70 and 140 mm) cause a linear increase in the heat transfer coefficient. It was found that for variable loading ratios there are two effects that combine to modify h susp , turbulence and suspension heat capacity.…”

Section: Introductionmentioning

confidence: 74%

“…On the other hand, when the Reynolds number ¼ 26,500 the effect of increased heat capacity is not significant (small particle residence time), so that the turbulence modulation promotes a decrease in h susp . Concerning loading ratios greater than 1, Avila and Cervantes (1995) verified that for a vertical pipe with constant wall temperature, an increase in the heat capacity of the suspension is the primary factor that promotes an increase in the average heat transfer coefficient. There is disagreement as to how small particles affect heat transfer.…”

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confidence: 90%

“…A similar behavior was experimentally observed by Depew and Farbar (1963) and Jepson et al (1963). Avila and Cervantes (1995) showed that the average heat transfer coefficient between gas and the suspension (h susp ) is a function of both the heat transported by the suspension, Q ¼ ð _ m m f C p þ _ m m p C PP ÞðT bulk out À T bulk in Þ, and the logarithmic mean temperature difference of the suspension. The average heat transfer coefficient is also a function of particle size, particle loading ratio, and suspension Reynolds number, which is a measure of the particles' residence time in the heated pipe.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Model for Heat Transfer in Dilute Turbulent Gas-Particle Flows

Haim

Weiss

Kalman

2007

Particulate Science and Technology

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The heat transfer between a vertical pipe wall and turbulent gas-particle flow is numerically investigated according to the Eulerian-Lagrangian approach and the k-e turbulence model. The particles are introduced homogeneously into the simulation volume by a unique technique referred to as an artificial feeding volume. The numerical code using additional computer programs is validated with available experimental results for the constant heat flux boundary condition. An average deviation of about 4% and a maximum deviation of about 7% were attained from the numerical predictions for various particle and pipe diameters. The effect of the geometrical parameters and the flow parameters on the gas=particle temperature, the convection heat transfer coefficient between the wall and the gas-particle mixture, and the thermal entry length were studied. An increase in particle diameter (loading ratio % 0.5) extended the thermal entry length and decreased the bulk mixed temperature, particle temperature, and convection heat transfer coefficient. Increasing the pipe diameter led to a significant reduction in bulk mixed temperature and thermal entry length, in addition to a decrease in particle temperature and Nusselt number. Increasing the loading ratio up to 2.36 led to a reduction in wall temperature and bulk mixed temperature, in addition to an increase in the convective heat transfer coefficient and thermal entry length.

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“…A larger solids' loading ratio results in a higher heat transfer coefficient from the hot wall to the gas-solids dense phase flow [42]. Although the overlap of data ranges is limited, the results have been compared with those of Avila et al [43] and Moriyama et al [40]. …”

Section: Mass Flow Rate Measurement Of Solids Based On Thermal Methodsmentioning

confidence: 98%

Review of techniques for the mass flow rate measurement of pneumatically conveyed solids

2011

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Analysis of the heat transfer coefficient in a turbulent particle pipe flow

Cited by 47 publications

References 15 publications

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

Characteristics of turbulence transport for momentum and heat in particle-laden turbulent vertical channel flows

Numerical Model for Heat Transfer in Dilute Turbulent Gas-Particle Flows

Review of techniques for the mass flow rate measurement of pneumatically conveyed solids

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