1. Rabon matsakaicin girman barbashi na kayan kafin a niƙa zuwa matsakaicin girman barbashi na samfurin bayan an niƙa

i=Dmax/dmax (Dmax—-Matsakaicin girman barbashi na kayan kafin a niƙa, dmax—-matsakaicin girman barbashi na kayan bayan an niƙa)

2. Rabon ingantaccen faɗin tashar ciyar da na'urar niƙa da faɗin buɗewar fitar da ruwa

i=0.85B/b (B—–Faɗin tashar ciyar da na'urar busarwa, b—–Faɗin buɗewar fitar da na'urar busarwa, 0.85—-Tabbatar cewa na'urar busarwa ta ciji faɗin kayan da ya dace.)

Darajar faɗin buɗewar fitar da ruwa: injin fitar da ruwa mai kauri yana ɗaukar matsakaicin faɗin buɗewar fitar da ruwa; injin murƙushewa na tsakiya yana ɗaukar mafi ƙarancin faɗin buɗewar fitar da ruwa.

3. i=Dcp/dcp

(Dcp—matsakaicin diamita na kayan kafin a niƙa; dcp—matsakaicin diamita na kayan bayan an niƙa)

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