Abstract
This paper presents experimental results on heat transfer characteristics of turbulent gaseous flow in a micro-tube with constant wall temperature. The experiment was performed for nitrogen gas flow through a micro-tube with 343 urn in diameter and 50 mm in length. The wall temperature was maintained at 310 K, 330 K and 350 K. The stagnation pressure is chosen in such a way that the exit Reynolds number ranges from laminar to turbulent. The total temperature at the outlet, the inlet stagnation temperature, the mass flow rate, and the inlet pressure were measured. The results show that the Nusselt number of gas flow is different from that of incompressible flow.
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