工程热物理学报
工程熱物理學報
공정열물이학보
JOURNAL OF ENGINEERING THERMOPHYSICS
2009年
9期
1502-1504
,共3页
宋文吉%肖睿%董凯军%何世辉%黄冲%冯自平
宋文吉%肖睿%董凱軍%何世輝%黃遲%馮自平
송문길%초예%동개군%하세휘%황충%풍자평
传热%TBAB%包络化合物浆%潜热输送
傳熱%TBAB%包絡化閤物漿%潛熱輸送
전열%TBAB%포락화합물장%잠열수송
heat transfer%TBAB%clathrate hydrate slurry%latent heat transportation
TBAB包络化合物浆具有易生成、高潜热及可流动性等特点,是一种良好的蓄冷及潜热输送介质,在中央空调系统中表现出光明的节能前景.本文采用实验方法,研究了B型TBAB包络化合物浆在定热流密度条件下,水平不锈钢管内的对流换热特性,流速涵盖了层流-湍流.通过研究流速V、固相含量X_s对换热系数α的影响,发现"换热降低区"和再层流化现象,得到层流区与湍流区的临界线.最后整理出对流换热的无量纲准则式,其计算结果与实验结果的相对误差在±20%以内.
TBAB包絡化閤物漿具有易生成、高潛熱及可流動性等特點,是一種良好的蓄冷及潛熱輸送介質,在中央空調繫統中錶現齣光明的節能前景.本文採用實驗方法,研究瞭B型TBAB包絡化閤物漿在定熱流密度條件下,水平不鏽鋼管內的對流換熱特性,流速涵蓋瞭層流-湍流.通過研究流速V、固相含量X_s對換熱繫數α的影響,髮現"換熱降低區"和再層流化現象,得到層流區與湍流區的臨界線.最後整理齣對流換熱的無量綱準則式,其計算結果與實驗結果的相對誤差在±20%以內.
TBAB포락화합물장구유역생성、고잠열급가류동성등특점,시일충량호적축랭급잠열수송개질,재중앙공조계통중표현출광명적절능전경.본문채용실험방법,연구료B형TBAB포락화합물장재정열류밀도조건하,수평불수강관내적대류환열특성,류속함개료층류-단류.통과연구류속V、고상함량X_s대환열계수α적영향,발현"환열강저구"화재층류화현상,득도층류구여단류구적림계선.최후정리출대류환열적무량강준칙식,기계산결과여실험결과적상대오차재±20%이내.
Tetra-n-butyl-ammonium bromide(TBAB)clathrate hydrate slurry(CHS)is one kind of secondary refrigerants.It is promising to be applied to air-conditioning or latent-heat transportation systems as a thermal stdrage or cold carrying medium for energy saving.It is a solid-liquid two-phase mixture,easy production and high latent heat and good fluidity.In this paper,the heat transfer characteristics of type B TBAB slurry in a horizontal stainless steel pipe flow were investigated with constant heat flux.Solid mass fraction and flow velocity were the experimental parameters under both laminar and turbulent conditions.One velocity region of weakened heat transfer and re-laminarization phenomenon were found,and then a flow type transition curve from laminar to turbulent flow was obtained.At last,criterial correlations of Nusselt number for laminar and turbulent flows in the form of power function were summarized,and the error with experimental results was within ±20%.