Specification for carbon-manganese steel tube (550 N/mm<sup>2</sup>) (tube less than 12.5 mm outside diameter) (weldable)

This study examined the effects of the inside-outside diameter ratio (Di/D0), concrete strength, and inside-outside reinforcement type of steel tube on the structural behavior of concrete-filled double-skin steel tubular (CFDT) beams. Towards this end, the failure type, load-deflection relationship, ultimate strength, and displacement ductility were compared and analyzed. The results showed that the maximum load-deflection and failure type are affected by the Di/D0 and the reinforcement method. Furthermore, the higher the Di/D0 was, the lower the restraint stress and maximum load became.

Download Full-text

Numerical Investigation of Heat Transfer Enhancement in a Circular Tube with Rectangular Opened Rings

Bulletin of Electrical Engineering and Informatics ◽

10.11591/eei.v4i1.331 ◽

2015 ◽

Vol 4 (1) ◽

pp. 18-25

Author(s):

Arkan Altaie ◽

Moayed R. Hasan ◽

Farhan Lafta Rashid

Keyword(s):

Heat Transfer ◽

Transfer Rate ◽

Circular Tube ◽

Rectangular Cross Section ◽

Steel Tube ◽

Transfer Enhancement ◽

Ansys Fluent ◽

Performance Factors ◽

Plain Tube ◽

Outside Diameter

Turbulent forced convection of coolant air flow (10 m/s velocity) in a steel tube of 50 cm long having outside diameter of 60 mm and inside diameter of 30 mm with constant outside surface temperature of 1000, 1200 and 1400 Ko is numerically analyzed. The renormalization group k-ε model is used to simulate turbulence in ANSYS - FLUENT 14.5. An opened ring of rectangular cross section (5x7 mm) is fitted in the tube and separated by 8cm pitch. Results of temperature and velocity distribution along the tube center line for the case of tube with internal ribs were compared with that of plain tube , these results show that the use of internal ribs enhance the heat transfer rate and found to possess the highest performance factors for turbulent flow.

Download Full-text