Study the effect of Nano fluid on Heat Transfer in Finned Pipe with Internal V-Cut Twisted Tape

This research presents an experimental and numerical study to investigate the heat transfer enhancement in a circular finned tube with V-Cut twisted tape having twist ratio (TR=1.85) by using metal oxide [γ-Al2O3 (20 nm)]/distilled water nanofluid as a coolant. The studied concentrations of nanofluids are (φ = 0, 3, 5% by volume) under turbulent flow condition. The experimental study including construct a test section, which consists of Aluminum tube of with external and internal diameter of (32 and 22 mm) respectively and (1.5 m) long,. The coolant flows through the inner tube under turbulent flow (3390 ≥ Re ≥ 10172) regime with constant inlet temperature of (60 oC). an‎d numerical simulation was under condition of (steady flow, three dimension, turbulent and incompressible flow and working fluid with φ = 0, 3, 5% by volume. Experimental and numerical results shows a high agreement, and the maximum difference was 2.3 % occurred with concentration (φ=5%) at Re = 6781.5, and the φ = 5% gave the best enhancement in heat transfer at Re =10172 where Nusselt number (Nu exp = 110.1 and Nunum =112.47).