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首页> 外文期刊>International Journal of Heat and Mass Transfer >Convective boiling heat transfer and two-phase flow characteristics inside a small horizontal helically coiled tubing once-through steam generator
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Convective boiling heat transfer and two-phase flow characteristics inside a small horizontal helically coiled tubing once-through steam generator

机译：小型水平螺旋盘管直流蒸汽发生器内部的对流沸腾传热和两相流动特性

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摘要

The pressure drop and boiling heat transfer characteristics of steam-water two-phase flow were studied in a small horizontal helically coiled tubing once-through steam generator. The generator was constructed of a 9-mm ID 1Cr18Ni9Ti stainless steel tube with 292-mm coil diameter and 30-mm pitch. Experiments were performed in a range of steam qualities up to 0.95, system pressure 0.5-3.5 MPa, mass flux 236-943 kg/m{sup}2 s and heat flux 0-900 kW/m{sup}2. A new two-phase frictional pressure drop correlation was obtained from the experimental data using Chisholm's B-coefficient method. The boiling heat transfer was found to be dependent on both of mass flux and heat flux. This implies that both the nucleation mechanism and the convection mechanism have the same importance to forced convective boiling heat transfer in a small horizontal helically coiled tube over the full range of steam qualities (pre-critical heat flux qualities of 0.1-0.9), which is different from the situations in larger helically coiled tube where the convection mechanism dominates at qualities typically > 0.1. Traditional single parameter Lockhart-Martinelli type correlations failed to satisfactorily correlate present experimental data, and in this paper a new flow boiling heat transfer correlation was proposed to better correlate the experimental data.
机译：在小型水平螺旋盘管直流蒸汽发生器中研究了汽水两相流的压降和沸腾传热特性。发生器由9毫米ID 1Cr18Ni9Ti不锈钢管制成，线圈直径为292毫米，节距为30毫米。在高达0.95的蒸汽质量，系统压力0.5-3.5 MPa，质量通量236-943 kg / m {sup} 2 s和热通量0-900 kW / m {sup} 2的范围内进行实验。使用Chisholm的B系数法从实验数据中获得了新的两相摩擦压降相关性。发现沸腾的热传递取决于质量通量和热通量。这意味着在整个蒸汽质量范围内（临界热通量质量为0.1-0.9），成核机制和对流机制对于小型水平螺旋盘管中强制对流沸腾传热具有相同的重要性。与较大的螺旋盘管的情况不同，在这种情况下，对流机构的质量通常大于0.1。传统的单参数Lockhart-Martinelli类型相关无法令人满意地关联当前的实验数据，因此本文提出了一种新的流动沸腾传热关联以更好地关联实验数据。

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