以常压去离子水为工质，对自然循环工况下上升加热段内单相水的摩擦阻力及对流传热特性进行了实验研究。
The friction and convective heat transfer of single phase water flow in a vertical heated tube at natural circulation condition were experimentally investigated.
实验结果表明，自然循环工况下上升加热段内工质的物性变化及由浮升力引起的自由流动对对流传热特性有重要影响。
The experimental results indicate that free convection caused by the buoyancy in the heated tube with natural circulation has great influence on the heat transfer characteristics.
以常压去离子水为工质，对自然循环工况下上升加热段内单相水的摩擦阻力及对流传热特性进行了实验研究。
The investigation on heat transfer of single phase liquid flow in a tube with natural circulation is performed.
得到了较为适合的垂直油道、水平油道自然对流换热特性数经验关联式，并据此得到了自然油循环变压器垂直油道和水平油道线饼表面温降和油流温升的计算方法。
Some useful formulas for convection calculation of vertical and horizontal duct are given. So temperature decrease at the surface of discs and temperature rise of oil flow can be obtained.
得到了较为适合的垂直油道、水平油道自然对流换热特性数经验关联式，并据此得到了自然油循环变压器垂直油道和水平油道线饼表面温降和油流温升的计算方法。
Some useful formulas for convection calculation of vertical and horizontal duct are given. So temperature decrease at the surface of discs and temperature rise of oil flow can be obtained.
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