Mathematical Problems in Engineering / 2013 / Article / Tab 1

Research Article

CFD Analysis of Heat Transfer and Friction Factor Characteristics in a Circular Tube Fitted with Quadrant-Cut Twisted Tape Inserts

Table 1

Details and thermo-physical properties of materials.

ParameterDescription

Test section
 Inner tube diameter (mm)25.4
 Outer tube diameter (mm)33
 Test tube length/mm 1800
 Material of test tubeSteel
 Density (Kg/m3)2719
 Specific heat (J/kg K)502.48
 Thermal conductivity (W/m K)16.27
Twist tape
 Tape pitch length ( , 360°)/mm75, 100, and 125
 Twist ratio ( )2.93, 3.91, 4.89
Linear distance of the tape for 360° rotation
Width of twisted tape
 Tape thickness/mm0.8
 Tape width/mm24.5
 ( ) cut depth/mm 5, 10, and 15
 Material of twist tapeAluminum
Test conditions
 FluidWater
 Reynolds number, Re 100–2100
 Type of flow in inner tubeLaminar
 Inlet temperature/°C25