The research provides a numerical and computational analysis of improving heat transfer rate in exchangers employing obstructing geometries such as Circular Ring, Ring with` clearance, Hexagonal ring tabulators with different pitch diameter ratios (PDR). All were evaluated flow obstruction areas 0.3, 0.4, 0.5. Flow area Reynolds number the variables that changed during testing. ratio employed i...

Hover performance of a twin-rotor test model in terms of rotor overlap sweep, blade collective pitch, and blade tip speedwasexaminedexperimentally.The experimental setup consisted of two three-bladed rotors (tandem rotor configuration) with a diameter of1,220 mm and constant chord of 38 mm, giving a blade aspect ratio of 16.05. The blades were of a rectangular planform with NACA 0012 cross-sect...

longevity of osseointegrated implants are intensely influenced by biomechanical factors. control of these factors prevents mechanical complications, which include fracture of screws, components, or materials veneering the framework. in this study, the impact of length and threads pitch of dental implants on the stress distribution and maximum von mises stress in implant-abutment complex and jaw...

In English Question+Answer (Q+A) pairs, periodicity typically emerges across turn space, to a degree of precision matching standards of music perception. Interactionallyaligned Q+A pairs display such shared periodicity across the turn, while unaligned pairs do not. Periodicity is measured as temporal location of f0 maxima or minima, ‘pikes’, in successive accented syllables. This study asks whe...

Primarily for aerospace applications, harmonic drives (HD’s) are high-ratio, compact torque transmission systems. This mechanical transmission employs a continuous deflection wave along a non-rigid gear, the socalled ‘flexspline’, to allow gradual engagement of gear teeth. A harmonic drive also contains a wave-generator (a ball-bearing assembly with a rigid elliptical inner-race) and a circular...

This study presents the optimization of heat transfer coefficient a micro bare tube exchanger. A physical and mathematical model exchanger was built in Matlab using simplified ε-number unit method. Using temperature minus 30°C 0.5–1.0 mm outer diameter, 1.7–8.0 longitudinal pitch, 1.7–5 transverse 1.0–5.0 m/s velocity at minimum free flow area, with carbon dioxide as refrigerant, comparative va...