Nondimensional Expression for the Relation between Pressure Drop and Flow Rate in Steam Generating Tubes

概要

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A method to express the relationship between pressure drop and flow rate in steam generating tubes is presented. The characteristics of the pressure drops is represented in nondimensional generalized forms. In a case of uniform heat flux along a tube, it is given by the following equation : ΔP^*=2/1κξ^3+(1-κ)ξ^2+2/1κξ Here, ΔP^*=nondimensional pressure drop defined in this report, ξ=nondimensional flow rate, υ"=specific volume of saturated steam, υ'=specific volume of saturated water, r_0=subcooling, r=latent heat of evaporation, κ={(υ"/υ')-1}r_0/r. The charts in cases of various heat flux distributions along tubes are showm. They can be used to study the influence of each factor such as pressure, subcooling and heat flux distribution and so on characteristics of pressure drop and to estimate the flow stability and the distribution of flow rates in parallel tubes.
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