An experimental research was conducted to investigate the effect of the arrangement of staggered pin fins on convective heat transfer of rotating rectangular ducts.Six test models were used in this experiment

which cover a parameter range of Sn/d =5.0

6.5 and 8.0

Sp/Sn =1.2

1.6 and 2.0

where d is the diameter of the pin fin

Sn and Sp

are the transverse space and twice the axial space between pin fins respectively.The results in the experimental range show that

the axial parameter

Sp/Sn between 1.2 and 1.6 will give the best result;in the transverse direction Sn/d=5.0 gives the highest heat transfer coefficient

but the pressure drop caused by this arrangment should be considered.