Author
Tahir Mushtaq Qureshi
Bio: Tahir Mushtaq Qureshi is an academic researcher from COMSATS Institute of Information Technology. The author has contributed to research in topics: Viscosity & Compressibility. The author has an hindex of 3, co-authored 9 publications receiving 19 citations.
Papers
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TL;DR: In this article, simple expressions for the permanent solutions corresponding to some oscillatory motions of two classes of Newtonian fluids with power-law dependence of viscosity on the pressure between two infinite horizontal parallel plates are provided.
Abstract: Abstract In this paper, we provide simple expressions for the permanent solutions corresponding to some oscillatory motions of two classes of Newtonian fluids with power-law dependence of viscosity on the pressure between two infinite horizontal parallel plates. The fluid motion is generated by the lower plate that applies an oscillatory shear stress to the fluid. Such solutions, which are lack in the existing literature, can be useful both for those who want to eliminate the transients from their experiments and as tests to verify numerical schemes that are developed to study complex unsteady flow problems of these fluids. The similar solutions corresponding to the motion due to a constant shear stress on the boundary are also determined and, contrary to our expectations, the shear stresses are constant on the whole flow domain although the associated velocity fields depend both of the spatial variable and the dimensionless pressure-viscosity coefficient. Finally, for validation, some comparative graphical illustrations are included and the convergence of starting solutions to the permanent solutions is graphically proved. Spatial profiles of starting solutions are also provided.
5 citations
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TL;DR: In this article, a low-dimensional physical model of small-amplitude oscillations of the vocal fold about its fulcrum point whose position is adjustable in both horizontal and vertical directions is proposed.
Abstract: A low-dimensional physical model of small-amplitude oscillations of the vocal
folds is proposed here. The model is a simplified version of the body-cover one in
which mucosal surface wave propagation has been approximated by the seesaw-like
oscillation of the vocal fold about its fulcrum point whose position is adjustable in
both the horizontal and vertical directions. This approach works for 180 degree
phase difference between the glottal entry and exit displacements. The fulcrum
point position has a significant role in determining the shape of the glottal flow.
The vertical position of the fulcrum point determines the amplitude of the glottal
exit displacement, while its horizontal position governs the shape and amplitude of
the glottal flow. An increment in its horizontal position leads to an increase in the
amplitude of the glottal flow and the time period of the opening and closing phases,
as well as a decrease in the time period of the closed phase. The proposed model is
validated by comparing its results with the low-dimensional mucosal surface wave
propagation model.
5 citations
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TL;DR: In this paper, exact and simple expressions for the permanent solutions corresponding to two oscillatory motions of incompressible upper-convected Maxwell fluids with exponential dependence of viscosity on the pressure between parallel plates have been established using suitable changes of the spatial variable and the unknown function and the Laplace transform technique.
Abstract: Exact and simple expressions for the permanent solutions corresponding to two oscillatory motions of incompressible upper-convected Maxwell fluids with exponential dependence of viscosity on the pressure between parallel plates have been established using suitable changes of the spatial variable and the unknown function and the Laplace transform technique. The solutions that have been obtained satisfy the boundary conditions and governing equations but are independent of the initial conditions. They are important for those who want to eliminate the transients from their experiments. The similar solutions for the simple Couette flow of the same fluids as well as known results for the Newtonian fluids performing the same motions were obtained as limiting cases. The convergence of starting solutions to the corresponding permanent components that has been graphically proved could constitute an asset on the correctness of obtained results. The influence of pertinent parameters on the fluid motion and the spatial profiles of starting solutions have been graphically depicted and discussed. The oscillations’ amplitude is an increasing function with respect to the dimensionless pressure–viscosity coefficient and the Weissenberg number. It is lower for the shear stress as compared to the fluid velocity. The three-dimensional distribution of the starting velocity fields has been numerically visualized by means of the two-dimensional contour graphs.
4 citations
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TL;DR: In this paper, a new approach for modeling the glottal flow is presented, which is based on three control volumes that strike a one-mass and two-springs system sequentially and generate a Glottal pulse.
Abstract: Glottal waveform models have long been employed in improving the quality of
speech synthesis. This paper presents a new approach for modeling the glottal flow.
The model is based on three control volumes that strike a one-mass and two-springs
system sequentially and generate a glottal pulse. The first, second and third control
volumes represent the opening, closing and closed phases of the vocal folds, respec-
tively. The masses of the three control volumes and the size of the first one are the
four parameters that define the shape, pitch and amplitude of the glottal pulse. The
model may be viewed as parametric approach governed by second order differential
equations rather than analytical functions and is very flexible for designing a glottal
pulse. The glottal pulse generated by the present model, when compared with those
generated by Rosenberg, LF and mucosal wave propagation models demonstrates
that it appropriately represents the opening, closing and closed phases of the vo-
cal fold oscillation. This leads to the validity of our model. Numerical solution of
the present model has been found to be very efficient as compared to its analytical
solution and two other well-known parametric models Rosenberg++ and LF. The
accuracy of the numerical solution has been illustrated with the help of analytical
solution. It has been observed that the accuracy improves by increasing the size of
the first control volume and may decrease insignificantly with increase in the mass
of any of the control volumes. Two experiments with the present model support
its successful implementation as a voice source in speech synthesis. Thus our model
renders itself as an efficient, accurate and realistic choice as a voice source to be
employed in real-time speech production.
4 citations
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TL;DR: The proposed model eliminates the need to get interpolation for the approximation of fractional delay and give efficient simulation for sound wave propagation in the two-dimensional waveguide modeling of the vocal tract.
Abstract: For many years, a digital waveguide model is being used for sound propagation in the modeling of the vocal tract with the structured and uniform mesh of scattering junctions connected by same delay lines. There are many varieties in the formation and layouts of the mesh grid called topologies. Current novel work has been dedicated to the mesh of two-dimensional digital waveguide models of sound propagation in the vocal tract with the structured and non-uniform rectilinear grid in orientation. In this work, there are two types of delay lines: one is called a smaller-delay line and other is called a larger-delay line. The larger-delay lines are the double of the smaller delay lines. The scheme of using the combination of both smaller- and larger-delay lines generates the non-uniform rectilinear two-dimensional waveguide mesh. The advantage of this approach is the ability to get a transfer function without fractional delay. This eliminates the need to get interpolation for the approximation of fractional delay and give efficient simulation for sound wave propagation in the two-dimensional waveguide modeling of the vocal tract. The simulation has been performed by considering the vowels /ɔ/, /a/, /i/ and /u/ in this work. By keeping the same sampling frequency, the standard two-dimensional waveguide model with uniform mesh is considered as our benchmark model. The results and efficiency of the proposed model have compared with our benchmark model.
3 citations
Cited by
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TL;DR: In this paper, the authors presented unsteady flow and heat transfer of nonlinear fractional upper-convected Maxwell (UCM) viscoelastic fluid along a vertical plate.
Abstract: The concept of fractional derivative is used to solve a variety of viscoelastic fluid problems. However, researchers mostly overlooked the consequences of nonlinear convection in the fractional viscoelastic fluid models and were concerned only with situations where the governing equations are linear. Most importantly, the nonlinear fluid models, whether classical or fractional, are solved for steady-state conditions. To overcome these limitations, this research presents unsteady flow and heat transfer of nonlinear fractional upper-convected Maxwell (UCM) viscoelastic fluid along a vertical plate. The governing equations of the fractional Maxwell fluid are developed by introducing Friedrich shear stress and Cattaneo heat flux models to the classical UCM fluid model. An additional feature to the invention of the constructed fractional model is the consequence of an external magnetic field. Moreover, the considered model comprises nonlinear, coupled, fractional partial differential equations. Therefore, a numerical scheme is developed with the aid of the L1-approximation of Caputo derivative and the Crank–Nicolson method. The effects of different regulating parameters on fluid features have been thoroughly investigated. The obtained results are exhibited graphically and discussed in detail. It is observed that the skin friction increases for the velocity relaxation time parameter, but an opposite behavior is observed against the velocity fractional derivative parameter. Moreover, a significant enhancement is noticed in the Nusselt number for increasing estimates of the Prandtl number.
9 citations
01 Jan 1992
4 citations
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TL;DR: The proposed model eliminates the need to get interpolation for the approximation of fractional delay and give efficient simulation for sound wave propagation in the two-dimensional waveguide modeling of the vocal tract.
Abstract: For many years, a digital waveguide model is being used for sound propagation in the modeling of the vocal tract with the structured and uniform mesh of scattering junctions connected by same delay lines. There are many varieties in the formation and layouts of the mesh grid called topologies. Current novel work has been dedicated to the mesh of two-dimensional digital waveguide models of sound propagation in the vocal tract with the structured and non-uniform rectilinear grid in orientation. In this work, there are two types of delay lines: one is called a smaller-delay line and other is called a larger-delay line. The larger-delay lines are the double of the smaller delay lines. The scheme of using the combination of both smaller- and larger-delay lines generates the non-uniform rectilinear two-dimensional waveguide mesh. The advantage of this approach is the ability to get a transfer function without fractional delay. This eliminates the need to get interpolation for the approximation of fractional delay and give efficient simulation for sound wave propagation in the two-dimensional waveguide modeling of the vocal tract. The simulation has been performed by considering the vowels /ɔ/, /a/, /i/ and /u/ in this work. By keeping the same sampling frequency, the standard two-dimensional waveguide model with uniform mesh is considered as our benchmark model. The results and efficiency of the proposed model have compared with our benchmark model.
3 citations