Forced convection heat transfer of polymer melt flow inside channels with contraction/expansion sections

Zdanski, P. S. B.; Vaz, M.; Dias, Allan Patrick Cordeiro

doi:10.1016/j.icheatmasstransfer.2011.08.006

Cited by 11 publications

(2 citation statements)

References 16 publications

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“…They employed the modified models of Cross and power-law and temperaturedependent properties for the fluid and considered the low temperature difference ( ΔT = 20 K ) between the flowing fluid at the channel inlet and the channel walls. In another study, Zdanski et al [27] investigated numerically the nonisothermal flow of polymer melt inside the channel with an asymmetric contraction/expansion sections by employing the Cross model to find the distributions of local and global Nu. They assumed that the viscosity and relaxation time properties are temperature dependent, and the temperature difference between the flowing fluid at the channel inlet and the channel walls is low ( ΔT = 20 K ).…”

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confidence: 99%

Effects of fluid inertia and elasticity and expansion angles on recirculation and thermal regions of viscoelastic flow in the symmetric planar gradual expansions

Shahbani-Zahiri

Shahmardan

Norouzi

2018

J Braz. Soc. Mech. Sci. Eng.

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The formation and growth of symmetric and asymmetric recirculation regions play an important role in the viscous dissipations, temperature distribution, and heat transfer rate. In this study, the inertial and non-isothermal flow of viscoelastic fluid has been simulated in the planar channel with a 1:3 symmetric gradual expansion for different Reynolds and elasticity numbers at three expansion angles of 30°, 45°, and 60°. Also, the thermal boundary condition of constant temperature has been used on the walls, and the constitutive equation of exponential Phan Thien-Tanner has been employed for modeling the polymeric stresses of the viscoelastic fluid. Due to the significant effect of temperature on the properties of the viscoelastic fluid, and the role of viscous dissipation in heat generation, the fluid properties are considered temperature dependent, and the terms of viscous dissipation are considered in the energy equation. The main purpose of current study is to investigate the effects of fluid inertia and elasticity and the expansion angles on the flow pattern, heat transfer characteristics, and viscous dissipation of inertial viscoelastic flow in the planar channel with gradual expansions. Therefore, the streamlines, length of vortices, isothermal lines, total viscous dissipations, and local and mean Nusselt numbers (Nu) have been examined inside the channel expansion for different Reynolds and elasticity numbers in the range of 10 ≤ Re ≤ 100 and 0.01 ≤ El ≤ 2. The results show that the maximum values of local Nusselt numbers are enhanced by increasing the Reynolds and elasticity numbers and the expansion angle for the hydrodynamically and thermally developing conditions.

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confidence: 99%

Effects of fluid inertia and elasticity and expansion angles on recirculation and thermal regions of viscoelastic flow in the symmetric planar gradual expansions

Shahbani-Zahiri

Shahmardan

Norouzi

2018

J Braz. Soc. Mech. Sci. Eng.

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“…It is expected that the kiln geometric configuration, as well as lumber stacking, and sticker number, geometry, and placement affect both the head loss and flow aerodynamics and, as a consequence, the flow operating condition (and, ultimately, the drying rate). Based upon the authors' experience in modelling and simulation of forced convection heat transfer in industrial problems (e.g., [10][11][12]), a full scale, globally iterative coupled simulation (in conjunction with the fan performance curve to obtain the operation point) of air flow and heat and mass transfer is computationally intensive and, within the industrial environment, would require CFD advanced users to select proper model settings. Therefore, the present system approach aims at developing a simpler model and is yet able to obtain good approximations to the physical phenomena.…”

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confidence: 99%

Conjugated Heat and Mass Transfer in Convective Drying in Compact Wood Kilns: A System Approach

Vaz

Zdanski

Cerqueira

et al. 2013

Advances in Mechanical Engineering

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Drying is a required operation in timber manufacturing industries. Most drying processes utilise convective kilns, which involve coupling between transient heat and mass (moisture content) transfer in solids and convection in a flowing medium. In the present work, the flow field in the kiln is determined using a system approach based on a general head loss equation, whereas the coupling between transient heat and mass transfer in the timber is accomplished by a solution of a local differential model across the timber stack. The scheme is applied to study the effects of distinct geometric kiln configurations and air flow temperatures upon drying rates and moisture content.

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Simulation of an innovative reactor for waste plastics pyrolysis

Yin

Chen

Wang

et al. 2014

Chemical Engineering Journal

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Forced convection heat transfer of polymer melt flow inside channels with contraction/expansion sections

Cited by 11 publications

References 16 publications

Effects of fluid inertia and elasticity and expansion angles on recirculation and thermal regions of viscoelastic flow in the symmetric planar gradual expansions

Effects of fluid inertia and elasticity and expansion angles on recirculation and thermal regions of viscoelastic flow in the symmetric planar gradual expansions

Conjugated Heat and Mass Transfer in Convective Drying in Compact Wood Kilns: A System Approach

Simulation of an innovative reactor for waste plastics pyrolysis

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