Abstract
The necessary radius and length of material to avoid end effect in determining thermal conductivity by the transient method is discussed mathematically and experimentally. It is found that the dimensions of the material can be determined by the conditions b>5√ (Eq.(24)), and i≥ (π/0.4)√(Eq.(30)), by using the data after the elapsed time given by t> 20a2⁄a (Eq.(16)). These critical conditions are demonstrated to be valid experimentally and may be applied widely to the transient method.
