Interface-inspired convection is a key heat transfer scheme for hot spot cooling and thermal energy transfer. An unavoidable trade-off of the convective heat transfer is pressure loss caused by fluidic resistance on an interface. To overcome this limitation, we uncover that nano-inspired interfaces can trigger a peculiar fluidic interactivity, which can pursue all the two sides of the coin: hea...

We construct a simple analytic model for wall-bounded turbulence, containing only four adjustable parameters. Two of these parameters are responsible for the viscous dissipation of the components of the Reynolds stress tensor. The other two parameters control the nonlinear relaxation of these objects. The model offers an analytic description of the profiles of the mean velocity and the correlat...

The IEEE 802.16 Standard, first published in 2001, defines a means for wireless broadband access as a replacement for current cable and DSL "last mile" services to home and business. The adoption of this standard is currently in progress through the use of WiMAX Forum certified networking equipment and widespread adoption should appear over the next few years. This paper provides an overview of...

Abstract: The meteorological preprocessor used routinely at the Finnish Meteorological Institute (FMI) has been modified in order to better represent urban conditions. We have re-evaluated the roughness length, introduced the zero-displacement height and divided the surface layer into a roughness sublayer and an inertial sublayer. The friction velocity and Monin-Obukhov length are evaluated usi...

When a shock wave impinges upon a wall, it penetrates the boundary layer along the surface and both the shock wave and the boundary layer are changed from their undisturbed states. If the boundary layer remains unseparated, these mutually induced changes take place in a small interaction region. For a turbulent boundary layer, it has been established [1-8] that an asymptotic description of the ...

We investigate the enstrophy dynamics in relation to objective Eulerian coherent structures (OECSs) and their impact on scalar transport near turbulent/non-turbulent interface (TNTI) flows with without stable stratification. confirm that vortex-stretching produces inside boundaries of OECSs, while viscous diffusion transfers across structures. Although often overlooked literature, dissipation w...

We study the effect of droplet coalescence on turbulent wall-bounded flows by means direct numerical simulations. In particular, volume-of-fluid and front-tracking methods are used to simulate channel containing coalescing non-coalescing droplets, respectively. find that droplets have a negligible drag, whereas ones steadily increase drag as volume fraction dispersed phase increases: indeed, at...

This paper presents a theoretical study on the velocity distribution and the friction factor of boundary layer flows with polymer additives starting from the concept of “stress deficit.” A novel method of order of magnitude analysis is developed, which converts the governing equations of boundary layer flow into a solvable ordinary differential equation, thus the total shear stress distribution...

Using a slip-length based level-set approach with adaptive mesh refinement, we have simulated axisymmetric droplet spreading for a dimensionless slip length down to O(10−4). The main purpose is to validate and where necessary improve the asymptotic analysis of Cox (1998) for rapid droplet spreading/dewetting, in terms of the detailed interface shape in various regions close to the moving contac...

In this paper we study the generation of Tollmien–Schlichting waves initiated by vibrations a wall where is coated with thin liquid film in transonic flow regime. Motion fluids are described two-dimensional Navier–Stokes equations assuming Reynolds number large. To find asymptotic solutions boundary layer, conduct an inspection analysis on affine transformations triple-deck model for subsonic a...