Showing papers in "Propulsion and Power Research in 2019"

TL;DR: In this paper, the authors examined the combined effect of thermal radiation and velocity slip along a convective heated stretching sheet, and the main structure of partial differential equations attained in the form of momentum, energy and concentration equations.

TL;DR: In this article, the effects of heat generation/absorption and chemical reaction on the unsteady magnetohydrodynamic (MHD) Casson fluid flow past over exponentially accelerated vertical plate embedded in porous medium are studied.

TL;DR: In this article, a theoretical study for magnetohydrodynamic pumping of electro-conductive couple stress physiological liquids (e.g. blood) through a two-dimensional ciliated channel is conducted.

TL;DR: In this paper, the thermal and velocity slips of boundary layer of Williamson nanofluid over a stretching sheet are studied numerically by using the shooting method, and the effects of non-Newtonian Williamson parameter, velocity and thermal slip parameters, Prandtl number, Brownian parameter, Schmidt number, Lewis number, and thermophoresis parameter on velocity, temperature and concentration fields are shown graphically and discussed.

TL;DR: In this article, the authors investigated theoretically the entropy generation in mixed convection magnetohydrodynamic (MHD) flow of an electrically-conducting nanofluid from a vertical cylinder.

TL;DR: In this paper, the effects of various model parameters such as thermal Rayleigh number, nanoparticles volume fraction and nanoparticles shape factor are studied and the results indicate that the average Nusselt numbers are higher for the blade shape of nanoparticles.

TL;DR: In this article, the set of governing equations have been reframed and put into a dimensionless form under the assumption of low Reynolds number with appropriate dimensionless quantities that can fit into the finite element formulation.

TL;DR: In this paper, a numerical simulation is presented to investigate the effect of an exponentially varying magnetic field on three dimensional flow of Zinc Oxide-Society of Automotive Engineers 50 nanolubricant (ZnO-SAE50nano-lubricant) past a stretching sheet.

TL;DR: In this article, the authors used two-dimensional axisymmetric models to evaluate the performance of conical plug and truncated plug nozzles and compared the performance when a base bleed was introduced.

TL;DR: In this paper, numerical analysis and optimization in a single and multiple walled carbon nanotube-water nanofluid filled lid driven cavity having an inner elliptic obstacle were performed by using finite element method and COBYLA optimization solver.

TL;DR: In this paper, a model is developed to analyze the behavior of nanofluids taking into account the solid volume fraction and the governing equations are obtained based on the Darcy-s law for the porous medium and Tiwari and Das model to define the nano-fluid.

TL;DR: In this article, a steady boundary layer flow over a porous flat plate has been considered and the plate concentration is considered in the form of power law instead of taking constant, and the governing PDEs are transformed into ordinary differential equations using similarity transformation and then these ODEs were solved by employing Runge-Kutta fourth order method associated with shooting technique.

TL;DR: In this article, the stagnation point region (suspended with nanofluid and microorganisms) is examined subjected to velocity and thermal slips and a significant decrease in skin-friction coefficients has been detected with respect to thermal slip in comparison to velocity slip.

TL;DR: In this article, a comparative analysis of various semi-numerical schemes has been made for the case of squeezing flow of an incompressible viscous fluid between two large parallel plates having no-slip at the boundaries.

TL;DR: In this article, the second law analysis of classical Blasius flow accounting the effects of nonlinear radiation and frictional heating is performed using similarity transformations and the set of resultant ordinary differential equations are solved numerically.

TL;DR: In this paper, the authors present a brief overview of wall bounded flow transition in general and focus more on the transition process in the free shear layer of separation bubbles, demonstrating that at elevated free-stream turbulent intensity the so called bypass transition could occur in geometrically induced separation bubbles where the separation point is fixed.

TL;DR: Considering the self-ignition characteristic and C/H ratio, n -heptane and toluene (6:4 by mass) are chosen to constitute diesel surrogate fuel, and a reduced oxidation mechanism was developed as discussed by the authors.

TL;DR: In this paper, the authors describe similarity solution to a general scheme for the wall jet flow of nanofluids, accounting both the similarity branches (say upper and lower), allowed with respect to the suction and moving wall conditions in the context of Glauert type e-jets.

TL;DR: In this article, a two-stroke opposed-piston aircraft diesel engine based on the assumed scavenging model was analyzed in a zero-dimensional engine model created in the AVL BOOST program.

TL;DR: In this article, an analytical solution for natural convection flow in a vertical annulus due to time-periodic heating of annulus surfaces is presented, where closed-form expressions for velocity, temperature, skin-friction, mass flow rate and rate of heat transfer are obtained by solving the present mathematical model after separating into steady component and periodic regime.

TL;DR: In this article, the authors investigate the burning rate, ignition delay, and flame characteristics of ammonium perchlorate (AP)-hydroxyl terminated poly-butadiene (HTPB) [AP/HTPB] based composite propellants (CSP's) in sub-atmospheric pressure regimes (13kPa-100kPa).

TL;DR: In this paper, the authors investigated the impact of anti-vortex holes design on the film cooling performance in a film-cooled rotor blade model using the large eddy simulation method (LES).

TL;DR: In this paper, Carreau fluid is taken into account to study its peristaltic flow with Hall and ion-slip effects in a wave frame of reference for both asymmetric and symmetric channel.

TL;DR: In this article, the leakage performance of labyrinth seal for oil sealing on high-speed sealing test rig at different working and geometric parameters was evaluated, and an optimal composition of tooth tip thickness, teeth number, oil-throwing angle and front inclined angle was found.

TL;DR: In this article, the influence of elasticity on peristaltic transport of Herschel-Bulkley fluid in a tube of non-uniform cross-section is investigated.

TL;DR: In this article, the effect of Reynolds number, nanoparticles volume fraction, rib height and rib location on the flow and thermal characteristics of a confined slot impinging jet with nanofluid has been numerically investigated over Reynolds number ranges of 200-1000.

TL;DR: In this paper, the authors used the large eddy simulation method to investigate the film-cooling performance in a low-speed rotor blade of a 1-1/2 turbine stage.

TL;DR: In this article, the authors present numerical studies on the interaction between novel combustion concepts and conventional high pressure turbine (HPT) stages, and reveal a decrease in turbine efficiency with transient inflow conditions compared to a steady-state inflow case.

TL;DR: In this article, the enhanced (G ′ / G ) -expansion method has been applied to find the closed form solutions for NLEEs, such as the simplified MCH equation and third extended fifth order nonlinear equations which are very important in mathematical physics.

TL;DR: In this article, a two-shaft gas turbine engines with four-port wave rotors is compared to the performance of the baseline engines, and it is concluded that important benefits are obtained with respect to the ones of the wave rotor-topped engines in terms of specific work and specific fuel consumption.