Resin Flow, Cure and Heat Transfer Analysis for Pultrusion Process

1994 ◽  
Vol 28 (6) ◽  
pp. 486-506 ◽  
Author(s):  
R. Gorthala ◽  
J. A. Roux ◽  
J. G. Vaughan
Keyword(s):  
Heat Transfer ◽  
Velocity Profile ◽  
Variable Viscosity ◽  
Control Volume ◽  
Pressure Profile ◽  
Heat Transfer Analysis ◽  
Direct Result ◽  
Resin Flow ◽  
Degree Of Cure ◽  
Pultrusion Process

This work presents temperature and degree of cure profiles within a pultruded composite and focuses on the development of different models used for predicting the velocity profile including a slip velocity model. This study uses a variable viscosity model and highlights the results for the velocity profile, viscosity of resin within a pultrusion die, gelation lengths, iso-gelation lines, and axial pressure profile. Gelation was predicted to occur at about one-third the distance down the die length and the degree of cure at gelation was computed to be about 0.34. The composite systems considered in this study are graphite/epoxy and fiberglass/epoxy. A comprehensive two-dimensional mathematical model in cylindrical coordinates was developed for resin flow, cure and heat transfer associated with the pultrusion process. A control-volume-based finite difference method (Patankar method) was used for solving the governing equations. The model can be utilized for ascertaining the effects of pultrusion process variables on the characteristics of the cured composite; this primarily reduces to a large extent the trial and error experimentation often required. Moreover, insight for characterization and optimization of the pultrusion process is a direct result of this modeling.

MHD slip flow and convective heat transfer due to a moving plate with effects of variable viscosity and thermal conductivity

2020 ◽  
Vol 16 (5) ◽  
pp. 991-1018
Author(s):  
Mahantesh M. Nandeppanavar ◽  
M.C. Kemparaju ◽  
R. Madhusudhan ◽  
S. Vaishali
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Boundary Layer ◽  
Differential Equations ◽  
Radiation Effects ◽  
Variable Viscosity ◽  
Heat Transfer Analysis ◽  
Concentration Profiles ◽  
Moving Plate ◽  
Content Type

PurposeThe steady two-dimensional laminar boundary layer flow, heat and mass transfer over a flat plate with convective surface heat flux was considered. The governing nonlinear partial differential equations were transformed into a system of nonlinear ordinary differential equations and then solved numerically by Runge–Kutta method with the most efficient shooting technique. Then, the effect of variable viscosity and variable thermal conductivity on the fluid flow with thermal radiation effects and viscous dissipation was studied. Velocity, temperature and concentration profiles respectively were plotted for various values of pertinent parameters. It was found that the momentum slip acts as a boost for enhancement of the velocity profile in the boundary layer region, whereas temperature and concentration profiles decelerate with the momentum slip.Design/methodology/approachNumerical Solution is applied to find the solution of the boundary value problem.FindingsVelocity, heat transfer analysis is done with comparing earlier results for some standard cases.Originality/value100

A Reduced Dimension Finite Volume Method for Radiative Heat Transfer in Axisymmetrical Cylinders

Volume 4 ◽  
2004 ◽  
Author(s):  
Weixue Tian ◽  
Wilson K. S. Chiu
Keyword(s):  
Heat Transfer ◽  
Finite Volume Method ◽  
Finite Volume ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Control Volume ◽  
Heat Transfer Analysis ◽  
Radiative Energy ◽  
Conductive Heat ◽  
Volume Method

This paper presents a modified scheme to analyze the radiative heat transfer in axisymmetrical enclosures using the finite volume method. The modified scheme is derived from the conservation of radiative energy in an infinitely thin slice of an axisymmetrical cylinder. Therefore, the final discretized equations are based on a two-dimensional mesh in the spatial domain, and similar to meshes used for convective and conductive heat transfer analysis. The control angle overlap problem caused by misalignment of solid angles with control volume faces in the angular direction is eliminated. Error caused by the control volume face curvature is also eliminated. Comparison of results for several demonstration cases with literature yields satisfactory results.

Heat Transfer Analysis on the Peristaltic Motion with Slip Effects

2010 ◽  
Vol 65 (8-9) ◽  
pp. 697-704 ◽  
Author(s):  
Tasawar Hayat ◽  
Zaheer Asghar
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Shear Stress ◽  
Variable Viscosity ◽  
Heat Transfer Analysis ◽  
Combined Effects ◽  
Small Reynolds Number ◽  
Peristaltic Motion ◽  
Long Wavelength ◽  
Slip Effects

The purpose of this paper is to highlight the combined effects of heat transfer and slip characteristics of magnetohydrodynamic (MHD) fluid with variable viscosity in a channel. The slip condition is imposed in terms of shear stress. An analysis is performed to derive the perturbation solution for long wavelength and small Reynolds number assumptions. Expressions of stream function, temperature and heat transfer coefficient are constructed and discussed

Importance of convective heat transfer in flow of non-Newtonian nanofluid featuring Brownian and thermophoretic diffusions

2019 ◽  
Vol 29 (12) ◽  
pp. 4624-4641 ◽  
Author(s):  
Waqar Azeem Khan ◽  
Mehboob Ali ◽  
Muhammad Waqas ◽  
M. Shahzad ◽  
F. Sultan ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Source ◽  
Convective Heat Transfer ◽  
Design Methodology ◽  
Numerical Solutions ◽  
Pressure Profile ◽  
Boundary Region ◽  
Heat Transfer Analysis ◽  
Content Type ◽  
Source Sink

Purpose This paper aims to address the flow of Sisko nanofluid by an unsteady curved surface. Non-uniform heat source/sink is considered for heat transfer analysis. Design/methodology/approach Numerical solutions are constructed using bvp4c procedure. Findings Pressure profile inside boundary region is increased when A and K are enhanced. Originality/value No such analysis is yet presented.

scholarly journals Development of Pulsating Twin Jets Mechanism for Mixing Flow Heat Transfer Analysis

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Ali Ahmed Gitan ◽  
Rozli Zulkifli ◽  
Shahrir Abdullah ◽  
Kamaruzzaman Sopian
Keyword(s):  
Heat Transfer ◽  
Velocity Profile ◽  
Heat Transfer Analysis ◽  
Pulsation Frequency ◽  
Pulse Profile ◽  
Pulsed Jet ◽  
Impingement Heat Transfer ◽  
Twin Jets ◽  
Flow Heat ◽  
Transfer Problems

Pulsating twin jets mechanism (PTJM) was developed in the present work to study the effect of pulsating twin jets mixing region on the enhancement of heat transfer. Controllable characteristics twin pulsed jets were the main objective of our design. The variable nozzle-nozzle distance was considered to study the effect of two jets interaction at the mixing region. Also, the phase change between the frequencies of twin jets was taken into account to develop PTJM. All of these factors in addition to the ability of producing high velocity pulsed jet led to more appropriate design for a comprehensive study of multijet impingement heat transfer problems. The performance of PTJM was verified by measuring the pulse profile at frequency of 20 Hz, where equal velocity peak of around 64 m/s for both jets was obtained. Moreover, the jet velocity profile at different pulsation frequencies was tested to verify system performance, so the results revealed reasonable velocity profile configuration. Furthermore, the effect of pulsation frequency on surface temperature of flat hot plate in the midpoint between twin jets was studied experimentally. Noticeable enhancement in heat transfer was obtained with the increasing of pulsation frequency.

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