Usually, the heating, ventilation, and air conditioning (HVAC) duct system in buildings is a complex network of hollow metal pipes of rectangular or circular cross-section which behave as multimode waveguides when driven at RF and microwave frequencies of common interest. HVAC ducts can be used as a wireless communication channel for providing high-speed network access to offices [1]. An exampl...

Combining work of Serre and Zumbrun, Benzoni-Gavage, Serre, and Zumbrun, and Texier and Zumbrun, we propose as a mechanism for the onset of cellular instability of viscous shock and detonation waves in a finite-cross-section duct the violation of the refined planar stability condition of Zumbrun–Serre, a viscous correction of the inviscid planar stability condition of Majda. More precisely, we ...

To further understand the combustion characteristics of syngas/air, behaviors premixed flame at various hydrogen additions and opening ratios were investigated. The vessel is a half-open rectangular duct 50mm square by 900mm long. shape photographed high-speed camera pressure measured sensor closed end duct. effect two variables on dynamics are considered through analysis evolution overpressure...

In hot and dry climates, evaporative cooling of the air by water spray can be applied in several requirements, such as condensers which airflow is precooled before it reaches condenser. The interaction between droplets a complicated two-phase flow that affected parameters. Here, an Eulerian-Lagrangian 3D model was developed to investigate influence important parameters on performance rectangula...

A numerical study of steady-state, fully developed, MHD duct flows is presented for the case of an applied transverse magnetic field and a two-dimensional variation of the flow parameters in the plane perpendicular to the flow direction, with no variations in fluid properties. Solutions are found for (i) rectangular ducts with no obstacles and (ii) rectangular ducts containing thin flat plates,...

The present study investigates the peristaltic flow of couple stress fluid in a non-uniform rectangular duct with compliant walls. Mathematical modeling is based upon the laws of mass and linear momentum. Analytic solutions are carried out by the eigen function expansion method under long-wavelength and low-Reynolds number approximations. The features of the flow characteristics are analyzed by...