Reply To: Under low velocity, there is difference between hand calculation and simulation

[zhuxianyou1999]

Here is the geometry of the simulation model. The outer diameter is 40 mm, and inner tube diameter is 10 mm. the length of tube is 400 mm.

The materials of fluid and solid.

The settings for models and solution method are shown below: 

The heat flux used in calculation (q”) is from “Report definitions-surface report-area weighted average-wall fluxes-total surface heat flux”.