— i ^ r V ) — pUV + r±du+i Li2r, f^f ** r2 de r de d z r d r i d r d r

U: Radial velocity component V: Tangential velocity component W: Axial velocity component

After finalizing the governing equations, it is necessary to provide auxiliary equations to estimate fluid properties and to specify appropriate initial and boundary conditions. These aspects are discussed in the next section.

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