Research Article
Comparative Studies on Thermal Performance of Conic Cut Twist Tape Inserts with SiO2 and TiO2 Nanofluids
Table 3
Technical details of experimental setup and test conditions.
| Setup and conditions | Description |
| (A) Experimental setup | | (a) Inner tube inner diameter (di) | 25.40 mm | (b) Outer tube inner diameter (do) | 33.35 mm | (c) Test tube length | 1800 mm | (d) Material of inner tube | Stainless steel 304L | (f) Insulation material | Asbestos rope and glass wool | (g) Temperature measurements | RTD Pt 100 type (±0.75% accuracy) | (h) Flow measurements | TDS-100H ultrasonic flowmeter (±0.1% accuracy) | (i) Pressure measurement | DMP3051 differential pressure transmitter (±0.2% accuracy) | (k) Heater capacity | 3 KW | (B) Typical twisted tape (TT) | | (a) Material | Aluminium | (b) Tape width () | 24.5 mm | (c) Tape thickness | 0.8 mm | (d) Tape pitch length (, 360°) | 75 mm | (e) Twist ratio ( = /di) | 2.93 | (C) Conic cut twisted tape | | (a) Material | Aluminium | (b) Tape width () | 24.5 mm | (c) Tape thickness | 0.8 mm | (d) Tape pitch length (, 360°) | 75 mm | (e) Twist ratio ( = /di) | 2.93 | (f) Quadrant cut twist tape (QCT) | = 5 mm, de = 5 mm | (g) Parabolic cut twist tape (PCT) | = 5.89 mm, de = 5 mm | (h) Triangular cut twist tape (VCT) | = 7.85 mm, de = 5 mm | (D) Test conditions | | (a) Reynolds number, (Re) | 200 to 1500 | (b) Type of flow in inner tube | Laminar |
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