Analysis of the effect of body shape on annubar factor using CFD

Flow analysis around an annubar in a circular pipe has been carried out using computational fluid dynamics (CFD) code, ‘FLUENT’ to establish the effect of body shape on the annubar factor. It is found out that the annubar factor for elliptical shape with high slenderness ratio has the highest annubar factor and minimum permanent pressure loss. Rounding of the edges of a standard diamond shaped annubar improves its performance. The permanent pressure loss is comparatively lower than that for the orifice meter and the annubar factor is constant above a critical Reynolds number. The annubar factor reduces with increase in blockage factor.