In a gas-atomization system, molten metal flows from the crucible through a melt delivery tube (MDT) and is atomized by high-speed gas into tiny droplets, which eventually solidify to form metal powder. The temperature of the molten metal decreases as it flows through the MDT, and the metal may solidify if its temperature drops below the liquidus temperature. This leads to clogging of the MDT. In the present study, a numerical investigation is done to estimate the molten metal temperature along the length of MDT during the flow. Three different geometries with 3 mm, 5 mm and 7 mm inner diameter (ID) of the MDT and five inlet velocities 0.936 m/s, 1.87 m/s, 2.5 m/s, 3.2 m/s, and 3.83 m/s of molten metal were considered. In each case, the length and wall thickness of MDT were kept constant. It is observed that the minimum temperature of the molten metal in the tube decreases with a decrease in the inlet velocity of flow of molten metal in the MDT, and also with a decrease in the ID of the MDT for the same wall thickness. A higher inlet velocity of molten metal is required to flow through an MDT of smaller ID to avoid clogging of molten metal.