Can we use (X = 0.05 ×D ×Re ) to find the developed area of flow inside the spiral tube?

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Tri Ayodha Ajiwiguna

IMO, yes you can if the effect of spiral geometry to the flow is negligible. Another thing is the flow regime should be laminar since that equation is for laminar flow.

K. V Sharma

The relation, X = 0.05 ×D ×Re is applicable for flow in straight tubes in the determination of entry length. For flow in spiral tube, the flow can no more be considered laminar.

Sabah F. H. Alhamdi

Nourish Vaferi, If the flow is laminar and the effect of spiral geometry on the flow is negligible, you can use it.