Evaluation of multi-holed orifice flowmeters under developing flow conditions – An experimental study

This study focuses on multi-holed orifice plates, which have superior flow measuring characteristics as compared to their conventional counterparts. However, literature is scant on quantitative parametric investigations. In this experimental study, the performance of a multi-holed orifice plate is evaluated for variable number of holes (n), equivalent diameter ratio (EDR), compactness ratio (C), plate thickness ratio (s/d) and upstream developing length (L/D) in developing flow regimes for the Reynolds number range of 24,500–55,500 by using Central Composite Design. A total number of 324 experiments were performed. It was found that EDR has the most significant effect on pressure loss coefficient, followed by ‘n’ and ‘C’. Moreover, it was found out that single orifice (SO) and multi-holed orifice (MO) have almost the same pressure losses for the same value of EDR/β. However, flow develops quickly for MOs. Higher values of coefficient of discharge were observed in the case of MOs as compared to the SOs with little effect of upstream disturbances. The effect of developing length is significant on the accuracy of orifice meter. However, when the multi-holed orifice plates are installed at 2D upstream length, the effect of upstream disturbances are diminished. This result provides the flexibility of installation, which means that multi-holed orifices can be installed at 2D. The experimental data is in good agreement with literature. Finally, an optimum orifice plate (5,0.4,0.7) was selected for flow developing region with minimum pressure loss coefficient based upon the experimental results. The influence of equivalent diameter ratio (EDR), number of holes (n) and compactness ratio (C) on pressure loss coefficient (K) is shown on the left. Three, four and five holed orifice plates are shown in the middle. The flow pattern and its effect on pressure loss is shown for the case of MOs (right). [Display omitted] •Performance of multi-holed orifice plates is evaluated in developing flow regimes.•Total 324 experiments are performed for the Reynolds number range of 26,500–55,400.•Porosity has the most significant effect on pressure loss coefficient, followed by number of orifices and compactness ratio.•Multi-holed orifice meters have higher discharge coefficient than standard orifices.•Multi-holed orifices can perform well in developing flows with 2D upstream length.