Optimal configuration of finned annulus in a double pipe with fully developed laminar flow

Syed, K.S.; Iqbal, Zafar; Ishaq, Muhammad

doi:10.1016/j.applthermaleng.2011.01.012

Cited by 30 publications

(18 citation statements)

References 19 publications

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“…Adaptive h refinement has been employed for highly accurate solutions. The FEM formulation of this governing system may be found in [7].…”

Section: Numerical Solutionmentioning

confidence: 99%

“…If the sole objective is to achieve the highest heat transfer coefficient irrespective of the rise in pressure loss, then usually the Nusselt number is used as an objective function, as has been done in the investigations [7][8][9]. However, if the available pumping power is limited and the pressure drop is of concern, then it is necessary to minimize the frictional loss together with the maximization of the Nusselt number.…”

Section: Optimization Problem and Its Solutionmentioning

confidence: 99%

“…Such types of finned ducts have been optimized by either optimizing the fin shape for specified geometry parameters [3][4][5] or by finding the optimum values of the configuration parameters for a given fin profile [6][7][8][9]. The detail of categorization of the problems and relevant literature review can be found in [2].…”

mentioning

confidence: 99%

“…The hydraulic and thermal performance of the optimum configurations has been evaluated by appropriate performance measures, and various optimum configurations have been proposed according to different concerns of the designers. In [7][8][9], optimum configurations were investigated by considering the Nusselt number as an objective function. A comparison of the optimum configurations based on both of these objective functions for both types of characteristic lengths has been given.…”

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confidence: 99%

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Optimum Convection Through Parabolic Fins in Annulus of Double Pipe

Iqbal¹,

Syed

Ishaq

2015

Journal of Thermophysics and Heat Transfer

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Optimum configurations of the parabolic finned annulus have been investigated for maximum convection by employing a genetic algorithm. The objective of the work is to enhance the heat transfer rate and minimize the pressure loss in the flow direction for optimum use of thermal energy and savings of cost. Flow is considered to be steady, laminar, incompressible, and fully developed, subjected to the constant heat flux boundary condition imposed at the finned inner pipe, made up of highly conductive material. A comparison of the present optimum configurations has been carried out with those based on the Nusselt number as an objective function. The results indicate that the present objective function gives, in many cases, cost-and weight-efficient optimum configurations with considerable reduction in pressure loss and provides optimum use of thermal energy along with handsome savings of cost. A comparison of the present optimum configurations of parabolic fins has also been carried out with those of trapezoidal and triangular fins. The results indicate that no single shape is best in all the situations and for all the criteria. The performance evaluation and comparison led to some very interesting findings regarding the configurations of the finned annulus and the choice of the objective function. The local results show that the fin tip plays a vital role for promoting the higher heat transfer rate.

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“…Adaptive h refinement has been employed for highly accurate solutions. The FEM formulation of this governing system may be found in [7].…”

Section: Numerical Solutionmentioning

confidence: 99%

Section: Optimization Problem and Its Solutionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Optimum Convection Through Parabolic Fins in Annulus of Double Pipe

Iqbal¹,

Syed

Ishaq

2015

Journal of Thermophysics and Heat Transfer

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“…This resulting sub-problem falls into the class of quadratic problems and their solutions can be found effectively by using some exact and approximate methods, which leads to the fast convergence to the global optimum. 36 Step-by-step mathematical procedure will be outlined as follows: 37,38 Step 1. Assume f ðxÞ, x 2 R n is the function to be minimised with x as a vector of required variables.…”

Section: Optimizationmentioning

confidence: 99%

Buckling optimization of composite laminates using a hybrid algorithm under Puck failure criterion constraint

Deveci

Aydın

Artem

2016

Journal of Reinforced Plastics and Composites

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In this study, an optimization procedure is proposed to find the optimum stacking sequence designs of laminated composite plates in different fiber angle domains for maximum buckling resistance. A hybrid algorithm combining genetic algorithm and trust region reflective algorithm is used in the optimization to obtain higher performance and improve the quality of solutions. As a novelty, Puck fiber and inter-fiber failure criteria are directly implemented to the optimization problems as nonlinear function constraints, which have allowed more consistent and feasible results. The performance of the hybrid algorithm is demonstrated by comparing with the individual performances of genetic and trust region reflective algorithms via test problems from the literature. Also, a study is performed to exhibit the effectiveness of the selected failure criterion as constraint among the other common criteria. The proposed procedure is used to solve many problems including various design considerations. The results indicate that reliable stacking sequence designs can be achieved in specific configurations even for the composite plates subjected to superior buckling loads when Puck physically based (3D) failure theory is considered as a first ply failure constraint in the buckling optimization.

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