CTAB/NaSal胶束溶液自然对流传热实验研究

摘要

In order to study the convection heat transfer to viscoelastic micelle solution comprehensively,an experimental work was carried out for the study of natural convection heat transfer from vertical heating plate to different concentrations of CTAB (cetyltrimethylammonium bromide) and NaSal (sodium salicylate) solutions (CTAB/NaSal) at different surface temperatures.The experimental results showed that NPR (percent Net Power Reduction) increased with increasing concentration or decreasing temperature of CTAB/NaSal micelle solutions.When the heating plate was 53 ℃,heating surface power to CTAB/NaSal (3 mmol/L:3 mmol/L) dropped 34.37％ than that to water.Furthermore,the natural convection heat transfer correlations influenced by We were established and the calculated values were in good agreement with experimental values.When 0.000 15 ≤ We2/Pr≤0.000 4,the established correlations can well describe the natural convection heat transfer Nux of CTAB/NaSal and its similar properties micelle solutions in the range of 4.98 × 105 ≤Rax ≤2.23 × 109 and 2.19 × 1010 ≤Rax ≤8.22 ×1010,respectively.%为全面研究胶束溶液的对流传热性能,在等温竖直平板加热壁面附近,通过实验研究了不同浓度CTAB(十六烷基三甲基溴化铵)与NaSal(水杨酸钠)复配的CTAB/NaSal胶束溶液,在不同壁面温度下的自然对流传热性能.实验结果表明:随着CTAB/NaSal胶束溶液质量分数增大、温度降低,NPR(净功率下降率)越大;加热壁面为53℃时,CTAB/NaSal(3 mmol/L:3 mmol/L)加热壁面输入功率相对于水下降34.37％.建立了We影响下的自然对流传热关联式,其误差在±10％以内;该关联式可用于计算CTAB/NaSal及其性质相似的胶束溶液在0.000 15≤We2/Pr≤0.000 4时,分别在4.98×105≤Rax≤2.23×109和2.19×1010≤Rax≤8.22×1010范围内的自然对流传热Nux.