Affiliation:
1. Dalian University of Technology
Abstract
Multi-hole orifices (MOs) is a promising throttle device applying in refrigeration system or plant.The geometric description of multi-hole orifices (MOs) is more complex than single-hole orifices (SOs). The flow control characteristics and structural system of MOs need to be investigated. This paper presents a comprehensive geometric description for MOs by a series of throttle experiments. This paper first defines a comprehensive set of geometric architectures involving orifice arrangement criteria and three geometric parameters, then investigates the effect of various geometric features on the pressure loss characteristics of MOs by throttle tests , finally develops practical models to evaluate the pressure loss coefficient of MOs. The presented structural system of MOs including orifice arrangement criteria, geometric parameters and throttle models, provides convenient conditions for structural design and manufacturing for MOs.
Publisher
Trans Tech Publications, Ltd.
Reference5 articles.
1. G. H. Gan and S. B. Riffat. Pressure Loss Characteristics of Orifice and Perforated Plates, Experimental Thermal and Fluid Science Vol. 14 (1997), pp.160-165.
2. G. Kojasoy, P. Kwame-Mensah, C. T Chang. Two-phase Pressure Drop in Multiple Thick and Thin Orifices Plates, Experimental Thermal and Fluid Science Vol. 15 (1997), pp.347-358.
3. M. Fossa, G. Guglielmini. Pressure Drop and Void Fraction Profiles During Horizontal Flow Through Thin and Thick Orifices, Experimental Thermal and Fluid Science Vol. 26 (2002), pp.513-523.
4. A.A. Saadawi, E. Grattan, W.M. Dempster. Two-phase Loss in Orifice Plates and Gate Valves in Large Diameter Pipes, in: G.P. Celata, P. Di Marco, R.K. Shah (Eds. ), 2nd Symp. Two-Phase Flow Modeling and Experimentation. ETS, Pisa, Italy, (1999).
5. International Organization for Standardization. Measurement of Fluid Flow by Means of Pressure Differential Devices-Part 1: Orifice plates, Nozzles and Venturi tubes Inserted in Circular Cross-section Conduits Running Full, ISO 5167-1. International Organization for Standardization, Geneva, (2003).