以电加热的方式,对高为800 mm,宽为60 mm,间隙分别为1.0 mm,1.8 mm和2.5 mm的竖直矩形流道内空气自然对流换热特性进行了实验研究,同时考察了在实验段出口是否有绝热烟囱对自然对流换热特性的影响.结果表明,在流道间隙为1.0 mm和1.8 mm的情况下,烟囱对自然对流换热特性的影响不明显.在间隙为2.5 mm时,烟囱的存在削弱了自然对流换热.同时所有实验数据可以按照有无烟囱的情况分别用统一的实验关联式进行拟合.
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