Numerical study of conjugate heat transfer in a double-pipe with exponential fins using DGFEM

Ahmad, Waseem; Syed, K.S.; Ishaq, Muhammad; Hassan, Ahmad; Iqbal, Zafar

doi:10.1016/j.applthermaleng.2016.09.171

Cited by 25 publications

(9 citation statements)

References 17 publications

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“…The observations/comments like large velocity gradients, high velocity zone, formation of one-dimensional flow, stagnant fluid at wall-fin assembly, and the effects of increasing fin height as well as number of fins, as mentioned in [15,23], can easily be observed in these figures. It may be noted again that the results of [15] are based on FEM.…”

Section: Resultsmentioning

confidence: 70%

“…The steps of algorithm employed in the present investigation are as follows: Initial (coarser) mesh is generated in the domain (Figure 1(b)); first the fluid region mesh is extracted and then momentum equation in it is solved; and in the last step, both the heat and energy equations are simultaneously solved in the whole domain. Due to the approximation of Riemann's problem by stabilized internal penalty flux in DG-FEM, the conditions of continuity at the fluid-solid interface are weakly imposed, automatically [23,24]. If the temperature gradient ( ) is along the normal, then the interface conditions (6i) and (6j) may be expressed as ,− = ,…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

“…Using these variables, the governing equations-momentum, energy, and heat equations-together with the corresponding boundary conditions may be expressed in dimensionless form as in [15,23].…”

Section: Problem Statement and Its Mathematical Modelmentioning

confidence: 99%

“…Their results recommended that the tip thickness may be considered in the designing of FDP. Waseem et al [23] presented the performance of exponential FDP numerically. They found that Nusselt number may have significant effect on the conductivities ratio values of solid and fluid.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Conjugate Heat Transfer Analysis of a Triangular Finned Annulus Based on DG-FEM

Ishaq

Syed

Iqbal³

et al. 2018

Mathematical Problems in Engineering

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A DG-FEM based numerical investigation has been performed to explore the influence of the various geometric configurations on the thermal performance of the conjugate heat transfer analysis in the triangular finned double pipe heat exchanger. The computed results dictate that Nusselt number in general rises with values of the conductivity ratio of solid and fluid, for the specific configuration parameters considered here. However, the performance of these parameters shows strong influence on the conductivity ratio. Consequently, these parameters must be selected in consideration of the thermal resistance, for better design of heat exchanger.

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Section: Resultsmentioning

confidence: 70%

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Section: Problem Statement and Its Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Conjugate Heat Transfer Analysis of a Triangular Finned Annulus Based on DG-FEM

Ishaq

Syed

Iqbal³

et al. 2018

Mathematical Problems in Engineering

Self Cite

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“…The local heat source intensity at any given time instant was computed by the solver recalling the MATLAB ® function written for the calculation of the local view factors. As reported in [12], the influence of axial thermal conduction on the temperature distribution within the tube wall was investigated developing a 3D model: in an opposite way to other thermal problems [18][19][20][21][22], simulations demonstrated how conjugate effects affect little the temperature field in the heated zone owing to the high conductive thermal resistance of the PVC tube. The analysis on the effects of tube angular velocity on the temperature distribution has therefore been carried out over 2D domains.…”

Section: Finite Element Modelmentioning

confidence: 99%

Effects of pipe angular velocity and oven configuration on tube temperature distribution in the radiative heating of PVC pipes

Lucchi

Lorenzini

2018

Int J Energy Environ Eng

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Several manufacturing processes in polymer industry aim at obtaining products by deforming preforms or sheets after a heating process. A thorough knowledge of the operating parameters of such heating processes is fundamental to fulfill the often high production requirements with the least energy consumption and to avoid unacceptable defects in the final product. A common example of such an application is the end-forming process of polyvinyl chloride (PVC) tubes, which are enlarged at one end in order to allow pipes connections. The heating phase which comes before the deformation process is usually carried out in ovens equipped with short wave infrared lamps; to ensure uniform heating, pipes rotate with a given angular velocity, which represents a fundamental parameter for the success of the whole manufacturing process. In this work, a transient analysis of the radiative heat exchange between rotating PVC pipes and infrared lamps in an oven for end-forming process has been conducted by means of a finite element model, in order to investigate the influence of cylinder angular velocity on the temperature distribution in the tube. Local view factors have been calculated for different oven configurations and have been expressed as a function of angular velocity, allowing pipe rotation to be simulated as a time-dependent boundary condition, instead of using a moving mesh. Simulations were carried out for different tubes geometries and angular velocities and results were compared with the case of a uniformly irradiated tube in terms of temperature displacement. For a given oven configuration, the results obtained by the numerical model can be used to find a critical angular velocity over which further increase does not lead to appreciable improvements in temperature evenness. The effect of the lamps' relative position was also investigated, showing a significant influence on critical angular velocities obtained. The model realized represents a potential tool to characterize the end-forming process in terms of critical angular velocity, leading to reductions in machine set-up time and product waste due to thermal failure.

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Impact of convective tip condition on the transient thermal behavior of wet porous convective radiative exponential profiled inclined longitudinal fin structures subject to heat generation

Nagaraja

Gireesha

2023

Heat Trans

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A convective‐radiative fully wet porous inclined longitudinal fin of exponential profile is the focus of the current work. The thermal behavior of the fin under unsteady conditions has been analyzed for adiabatic and convective boundary conditions. The exponential fin and its counterpart inverted exponential fin are simultaneously investigated by considering temperature‐relevant thermal conductivity and heat generation. The modeled governing equation upon nondimensionalization reduces to a partial differential equation which is computed by employing the finite difference approach. The impact of relevant parameters like the convective parameter, radiative parameter, wet porous parameter, dimensionless time, exponential index, dimensionless ambient temperature, generation number, thermal conductivity parameter, and angle of inclination on thermal characteristics of exponential and inverted exponential fin structures with adiabatic and convective boundary restrictions have been examined. One of the main outcomes was that the inverted exponential fin with an adiabatic tip gives rise to the highest thermal curve, and the tapered exponential fin with a convective tip resulted in the lowest thermal curve.

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Numerical study of conjugate heat transfer in a double-pipe with exponential fins using DGFEM

Cited by 25 publications

References 17 publications

A Conjugate Heat Transfer Analysis of a Triangular Finned Annulus Based on DG-FEM

A Conjugate Heat Transfer Analysis of a Triangular Finned Annulus Based on DG-FEM

Effects of pipe angular velocity and oven configuration on tube temperature distribution in the radiative heating of PVC pipes

Impact of convective tip condition on the transient thermal behavior of wet porous convective radiative exponential profiled inclined longitudinal fin structures subject to heat generation

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