Waqar Khan - Academia.edu (original) (raw)

Papers by Waqar Khan

Research paper thumbnail of Combined Analytical-Numerical Solution for MHD Viscous Flow over a Stretching Sheet

Journal of Computational Engineering, 2014

Research paper thumbnail of Heat Transfer From Solids With Variable Thermal Conductivity and Uniform Internal Heat Generation Using Homotopy Perturbation Method

Heat Transfer: Volume 1, 2008

Research paper thumbnail of Effect of Variable Thermal Conductivity on Heat Transfer From a Hollow Sphere With Heat Generation Using Homotopy Perturbation Method

Heat Transfer: Volume 1, 2008

Research paper thumbnail of An Effective Method for Seventh-Order Boundary Value Problems

Mathematical Sciences Letters, 2013

Research paper thumbnail of Accuracy of Trajectories Estimation in a Driver-Assistance Context

Lecture Notes in Computer Science, 2014

Research paper thumbnail of Fluid Flow and Heat Transfer in Power-Law Fluids Across Circular Cylinders: Analytical Study

Heat Transfer, Part A, 2005

Research paper thumbnail of Optimization of Pin-Fin Heat Sinks in Bypass Flow Using Entropy Generation Minimization Method

ASME 2007 InterPACK Conference, Volume 1, 2007

Research paper thumbnail of Stereo accuracy for collision avoidance

2009 24th International Conference Image and Vision Computing New Zealand, 2009

Research paper thumbnail of Comparing subspace methods for face recognition

2008 23rd International Conference Image and Vision Computing New Zealand, 2008

Abstract Methods of representing images by projection onto a linear subspace, such as Principal C... more Abstract Methods of representing images by projection onto a linear subspace, such as Principal Component Analysis (PCA), 2-Dimensional PCA (2D PCA), and two variants of robust Linear Discriminant Analysis (RLDA) using PCA to refine the chosen subspace, are compared by the accuracy of linear and nearest neighbour classification of the reduced and original image vectors. Experiments with the Olivetti-ATT Database of Faces and the Face Expression Database have shown that the RLDA with an extended subspace outperforms ...

Research paper thumbnail of Mixed Convection of Water at 4°C Along a Wedge with Variable Surface Flux in a Porous Medium

Transport in Porous Media, 2010

In this study, the mixed convection of water at 4°C along a wedge in a porous medium is investiga... more In this study, the mixed convection of water at 4°C along a wedge in a porous medium is investigated numerically using finite difference method. In order to explore the effect of mixed convection, both forced and free convection-dominated regimes are considered. Non-similarity solutions are obtained for the variable wall flux boundary condition. Velocity and temperature profiles as well as local dimensionless skin friction and Nusselt number are obtained and compared with the available numerical results for various values of different parameters. The wedge angle geometry parameter m and mixed convection parameter ξ are ranged from 0 to 1 in both regimes whereas different values of λ are considered for the purpose of comparison of heat transfer results.

Research paper thumbnail of Analytical Modeling of Fluid Flow and Heat Transfer in Micro/Nano-Channel Heat Sinks

ASME 2007 InterPACK Conference, Volume 1, 2007

Research paper thumbnail of Fluid Flow and Heat Transfer from Elliptical Cylinders: Analytical Approach

37th AIAA Thermophysics Conference, 2004

Research paper thumbnail of Performance of Shrouded Pin-Fin Heat Sinks for Electronic Cooling

38th AIAA Thermophysics Conference, 2005

Research paper thumbnail of Decommissioning Challenges in Thailand

SPE Asia Pacific Health, Safety, and Security Environment Conference and Exhibition, 2007

Abstract Thailand's oil and gas industry has been successful in finding and recovering h... more Abstract Thailand's oil and gas industry has been successful in finding and recovering hydrocarbon reserves in the Gulf of Thailand since last three decades and have currently installed over 200 fixed offshore structures. Some of these installations are now reaching ...

Research paper thumbnail of Decommissioning Challenges in Thailand

Proceedings of SPE Asia Pacific Health, Safety, and Security Environment Conference and Exhibition, 2007

Abstract Thailand's oil and gas industry has been successful in finding and recovering h... more Abstract Thailand's oil and gas industry has been successful in finding and recovering hydrocarbon reserves in the Gulf of Thailand since last three decades and have currently installed over 200 fixed offshore structures. Some of these installations are now reaching ...

Research paper thumbnail of Steady flow of Burgers’ nanofluid over a stretching surface with heat generation/absorption

Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2014

Research paper thumbnail of Behaviour of a Premixed Flame Subjected to Acoustic Oscillations

Research paper thumbnail of EPDM Based Double Slope Triangular Enclosure Solar Collector: A Novel Approach

The Scientific World Journal, 2014

Solar heating is one of the important utilities of solar energy both in domestic and industrial s... more Solar heating is one of the important utilities of solar energy both in domestic and industrial sectors. Evacuated tube heaters are a commonly used technology for domestic water heating. However, increasing cost of copper and nickel has resulted in huge initial cost for these types of heaters. Utilizing solar energy more economically for domestic use requires new concept which has low initial and operating costs together with ease of maintainability. As domestic heating requires only nominal heating temperature to the range of 60-90 °C, therefore replacing nickel coated copper pipes with any cheap alternate can drastically reduce the cost of solar heater. We have proposed a new concept which utilizes double slope triangular chamber with EPDM based synthetic rubber pipes. This has reduced the initial and operating costs substantially. A detailed analytical study was carried out to design a novel solar heater. On the basis of analytical design, a prototype was manufactured. Results obtained from the experiments were found to be in good agreement with the analytical study. A maximum error of 10% was recorded at noon. However, results show that error is less than 5% in early and late hours.

Research paper thumbnail of Large-Eddy Simulation of Bluff-Body Flame Using the Equilibrium Combustion Model

Journal of Thermophysics and Heat Transfer, 2014

Research paper thumbnail of Analytical modelling of free convection of non-Newtonian nanofluids flow in porous media with gyrotactic microorganisms using OHAM

Research paper thumbnail of Combined Analytical-Numerical Solution for MHD Viscous Flow over a Stretching Sheet

Journal of Computational Engineering, 2014

Research paper thumbnail of Heat Transfer From Solids With Variable Thermal Conductivity and Uniform Internal Heat Generation Using Homotopy Perturbation Method

Heat Transfer: Volume 1, 2008

Research paper thumbnail of Effect of Variable Thermal Conductivity on Heat Transfer From a Hollow Sphere With Heat Generation Using Homotopy Perturbation Method

Heat Transfer: Volume 1, 2008

Research paper thumbnail of An Effective Method for Seventh-Order Boundary Value Problems

Mathematical Sciences Letters, 2013

Research paper thumbnail of Accuracy of Trajectories Estimation in a Driver-Assistance Context

Lecture Notes in Computer Science, 2014

Research paper thumbnail of Fluid Flow and Heat Transfer in Power-Law Fluids Across Circular Cylinders: Analytical Study

Heat Transfer, Part A, 2005

Research paper thumbnail of Optimization of Pin-Fin Heat Sinks in Bypass Flow Using Entropy Generation Minimization Method

ASME 2007 InterPACK Conference, Volume 1, 2007

Research paper thumbnail of Stereo accuracy for collision avoidance

2009 24th International Conference Image and Vision Computing New Zealand, 2009

Research paper thumbnail of Comparing subspace methods for face recognition

2008 23rd International Conference Image and Vision Computing New Zealand, 2008

Abstract Methods of representing images by projection onto a linear subspace, such as Principal C... more Abstract Methods of representing images by projection onto a linear subspace, such as Principal Component Analysis (PCA), 2-Dimensional PCA (2D PCA), and two variants of robust Linear Discriminant Analysis (RLDA) using PCA to refine the chosen subspace, are compared by the accuracy of linear and nearest neighbour classification of the reduced and original image vectors. Experiments with the Olivetti-ATT Database of Faces and the Face Expression Database have shown that the RLDA with an extended subspace outperforms ...

Research paper thumbnail of Mixed Convection of Water at 4°C Along a Wedge with Variable Surface Flux in a Porous Medium

Transport in Porous Media, 2010

In this study, the mixed convection of water at 4°C along a wedge in a porous medium is investiga... more In this study, the mixed convection of water at 4°C along a wedge in a porous medium is investigated numerically using finite difference method. In order to explore the effect of mixed convection, both forced and free convection-dominated regimes are considered. Non-similarity solutions are obtained for the variable wall flux boundary condition. Velocity and temperature profiles as well as local dimensionless skin friction and Nusselt number are obtained and compared with the available numerical results for various values of different parameters. The wedge angle geometry parameter m and mixed convection parameter ξ are ranged from 0 to 1 in both regimes whereas different values of λ are considered for the purpose of comparison of heat transfer results.

Research paper thumbnail of Analytical Modeling of Fluid Flow and Heat Transfer in Micro/Nano-Channel Heat Sinks

ASME 2007 InterPACK Conference, Volume 1, 2007

Research paper thumbnail of Fluid Flow and Heat Transfer from Elliptical Cylinders: Analytical Approach

37th AIAA Thermophysics Conference, 2004

Research paper thumbnail of Performance of Shrouded Pin-Fin Heat Sinks for Electronic Cooling

38th AIAA Thermophysics Conference, 2005

Research paper thumbnail of Decommissioning Challenges in Thailand

SPE Asia Pacific Health, Safety, and Security Environment Conference and Exhibition, 2007

Abstract Thailand's oil and gas industry has been successful in finding and recovering h... more Abstract Thailand's oil and gas industry has been successful in finding and recovering hydrocarbon reserves in the Gulf of Thailand since last three decades and have currently installed over 200 fixed offshore structures. Some of these installations are now reaching ...

Research paper thumbnail of Decommissioning Challenges in Thailand

Proceedings of SPE Asia Pacific Health, Safety, and Security Environment Conference and Exhibition, 2007

Abstract Thailand's oil and gas industry has been successful in finding and recovering h... more Abstract Thailand's oil and gas industry has been successful in finding and recovering hydrocarbon reserves in the Gulf of Thailand since last three decades and have currently installed over 200 fixed offshore structures. Some of these installations are now reaching ...

Research paper thumbnail of Steady flow of Burgers’ nanofluid over a stretching surface with heat generation/absorption

Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2014

Research paper thumbnail of Behaviour of a Premixed Flame Subjected to Acoustic Oscillations

Research paper thumbnail of EPDM Based Double Slope Triangular Enclosure Solar Collector: A Novel Approach

The Scientific World Journal, 2014

Solar heating is one of the important utilities of solar energy both in domestic and industrial s... more Solar heating is one of the important utilities of solar energy both in domestic and industrial sectors. Evacuated tube heaters are a commonly used technology for domestic water heating. However, increasing cost of copper and nickel has resulted in huge initial cost for these types of heaters. Utilizing solar energy more economically for domestic use requires new concept which has low initial and operating costs together with ease of maintainability. As domestic heating requires only nominal heating temperature to the range of 60-90 °C, therefore replacing nickel coated copper pipes with any cheap alternate can drastically reduce the cost of solar heater. We have proposed a new concept which utilizes double slope triangular chamber with EPDM based synthetic rubber pipes. This has reduced the initial and operating costs substantially. A detailed analytical study was carried out to design a novel solar heater. On the basis of analytical design, a prototype was manufactured. Results obtained from the experiments were found to be in good agreement with the analytical study. A maximum error of 10% was recorded at noon. However, results show that error is less than 5% in early and late hours.

Research paper thumbnail of Large-Eddy Simulation of Bluff-Body Flame Using the Equilibrium Combustion Model

Journal of Thermophysics and Heat Transfer, 2014

Research paper thumbnail of Analytical modelling of free convection of non-Newtonian nanofluids flow in porous media with gyrotactic microorganisms using OHAM