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.

Parameter	Description
Test section
Inner tube diameter 𝑑𝑖 (mm)	25.4
Outer tube diameter 𝑑𝑜 (mm)	33
Test tube length/mm	1800
Material of test tube	Steel
Density (Kg/m^3)	2719
Specific heat (J/kg K)	502.48
Thermal conductivity (W/m K)	16.27
Twist tape
Tape pitch length (𝐻, 360°)/mm	75, 100, and 125
Twist ratio (𝑦=𝐻/𝑊)	2.93, 3.91, 4.89
𝐻	Linear distance of the tape for 360° rotation
𝑊	Width of twisted tape
Tape thickness/mm	0.8
Tape width/mm	24.5
(𝑤) cut depth/mm	5, 10, and 15
Material of twist tape	Aluminum
Test conditions
Fluid	Water
Reynolds number, Re	100–2100
Type of flow in inner tube	Laminar
Inlet temperature/°C	25