Numerical Analysis of Mixed Convection through an Internally Finned Tube

Rout, Sachindra Kumar; Mishra, Dipti Prasad; Thatoi, Dhirendra Nath; Acharya, A. K.

doi:10.1155/2012/918342

Cited by 16 publications

(14 citation statements)

References 23 publications

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“…Gradients of fluid variables were interpolated on a least squares cell-based approximation. As the applied body force is known and rather large, pressure was interpolated with a body-force-weighted approach which has been used with success in convection problems involving substantial body forces (Chandratilleke & Nadim, 2012;Rout et al, 2012). Momentum, turbulent kinetic energy, and specific dissipation rate were interpolated using the second-order upwind scheme.…”

Section: B Numerical Methodsmentioning

confidence: 99%

Numerical simulation of flows in a circular pipe transversely subjected to a localized impulsive body force with applications to blunt traumatic aortic rupture

Labbio¹,

Keshavarz‐Motamed²,

Kadem³

2017

Fluid Dyn. Res.

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Much debate surrounds the mechanisms responsible for the occurrence of blunt traumatic aortic rupture in car accidents, particularly on the role of the inertial body force experienced by the blood due to the abrupt deceleration. The isolated influence of such body forces acting on even simple fluid flows is a fundamental problem in fluid dynamics that has not been thoroughly investigated. This study numerically investigates the fundamental physical problem, where the pulsatile flow in a straight circular pipe is subjected to a transverse body force on a localized volume of fluid. The body force is applied as a brief rectangular impulse in three distinct cases, namely during the accelerating, peak, and decelerating phases of the pulsatile flow. A dimensionless number, termed the degree of influence of the body force (Ψ), is devised to quantify the relative strength of the body force over the flow inertia. The impact induces counter-rotating cross-stream vortices at the boundaries of the forced section accompanied by complex secondary flow structures. This secondary flow is found to develop slowest for an impact occurring during an accelerating flow and fastest during a decelerating flow. The peak skewness of the velocity field, however, occurred at successively later times for the three respective cases. After the impact, these secondary flows act to restore the unforced state and such dominant spatial structures are revealed by proper orthogonal decomposition of the velocity field. This work presents a new class of problems that requires further theoretical and experimental investigation.

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Section: B Numerical Methodsmentioning

confidence: 99%

Numerical simulation of flows in a circular pipe transversely subjected to a localized impulsive body force with applications to blunt traumatic aortic rupture

Labbio¹,

Keshavarz‐Motamed²,

Kadem³

2017

Fluid Dyn. Res.

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“…The degree of MF is expressed by a real number in the interval [0, 1]. The triangular MF is described by three parameters a ,b and c and defined by the following expression :- [11] Where the parameters (a) and (b) defined the "feet" of the triangle while , (c) defined the peak .For more elaborately the above equation can be written as :- [12] It is useful to mention that , fuzzy rule base is responsible to make inference in a fuzzy system. While, IF-THEN constructions, that have the general form "IF A THEN B" where A and B are propositions containing a linguistic variables.…”

Section: Fuzzy Inference Systemmentioning

confidence: 99%

“…PISO algorithm with a PRESTO (Pressure Staggered Option) scheme for the pressure-velocity coupling is used for the pressure correction equation. Suitable underrelaxation factors [12] for momentum, pressure and for energy had been used to get the better convergence. Quadlateral as well as triangular cells were used for the computational domain.…”

Section: Numerical Solution Proceduresmentioning

confidence: 99%

“…Cha et al [11] gave a computational fluid dynamics approach to solve the single stage iterance pulse tube refrigerator using well CFD solution software FLUENT and studied the multi-dimensional flow effects. However, various mathematical and numerical fascinating investigations had been done by different researchers to study the multi-dimensional flow effect, non-linear process, thermodynamic process and oscillatory flow [12]. The main objective of the first section is to study the pressure fluctuation as well as the cool down behavior at cold end due to varying in the porosity inside the porous region.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Transport Phenomenon inside a Pulse Tube Refrigerator Coupled with Fuzzy Logic Controller

Rout¹,

Hussein²,

Sahoo³

et al. 2013

ujme

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This research article illustrates a numerical study of single stage coaxial as well as inline Inertance-Type Pulse Tube Refrigerator (ITPTR). In this present work a computational fluid dynamic (CFD) approach has been adopted for numerical simulation purpose. The detail analysis of cool down behaviour, heat transfer at the cold end and the pressure variation inside the whole system has been carried out by using the most powerful computational fluid dynamic software package FLUENT. A number of cases have been solved by changing the porosity of the regenerator from 0.5 to 0.9 while the rest of the considered parameter are remains unchanged. The operating frequency for all the studied cases is (34 Hz) while the other system dimensions and the boundary conditions are considered unchanged for all cases. The results show that the porosity value of (0.6) produces a better cooling effect on the cold end of the pulse tube refrigerator. The variation of the pressure inside the pulse tube refrigerator during the process are also analysed. In this work an attempt has been made to make a thermally non-equilibrium model applied numerically to the porous region by considering two different energy equations to the solid matrix and for the fluid inside the porous medium and the results are compared with the thermally equilibrium model. In fact , to get an optimum parameter experimentally is a very tedious for iterance pulse tube refrigerator job , so that the CFD approach gives a better solution which is the main purpose of the present work. In the next part the fuzzy logic approach is applied to optimize the different component parameters that affect the cooling performance of the ITPTR. The investigation is performed with different design parameters such as the length and diameter of pulse tube and regenerator given as an input to the fuzzy controller while the output from the controller is the cold end temperature. The predicted optimum results have been verified by performing the confirmation tests.

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“…Extensive work has been carried out by different researchers, e.g., Rout et al (2012), to analyze a laminar heat exchanger with fins of various shapes and sizes. Experimental investigations show that the heat transfer characteristics and flow friction are greatly influenced by the fin spacing, size, and shape.…”

Section: Introductionmentioning

confidence: 99%

Application of the method of fundamental solutions to the analysis of fully developed laminar flow and heat transfer

Mrozek

Mierzwiczak

2015

jtam

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In this study, fully developed laminar flow and heat transfer in an internally longitudinally finned tube are investigated through application of the meshless method. The flow is assumed to be both hydrodynamically and thermally developed, with a uniform outside-the-wall temperature. The governing equations have been solved numerically by means of the method of fundamental solutions in combination with the method of particular solutions to obtain the velocity and temperature distributions. The advantage of the proposed approach is that it does not require mesh generation on the considered domain or its boundary, but uses only a cloud of arbitrarily located nodes. The results, comprising the friction factor as well as the Nusselt number, are presented for varied length values and fin numbers, as well as the thermal conductivity ratio between the tube and the flowing fluid. The results show that the heat transfer improves significantly if more fins are used.

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Numerical Analysis of Mixed Convection through an Internally Finned Tube

Cited by 16 publications

References 23 publications

Numerical simulation of flows in a circular pipe transversely subjected to a localized impulsive body force with applications to blunt traumatic aortic rupture

Numerical simulation of flows in a circular pipe transversely subjected to a localized impulsive body force with applications to blunt traumatic aortic rupture

Numerical Analysis of Transport Phenomenon inside a Pulse Tube Refrigerator Coupled with Fuzzy Logic Controller

Application of the method of fundamental solutions to the analysis of fully developed laminar flow and heat transfer

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