The present study investigates experimentally heat transfer of the forced convection boiling of a R134a/nano oil mixture in a horizontally-aligned tube with an aluminum helical fin. The effects of various parameters including refrigerant mass flow, vapor quality, star-shaped fin, oil concentration and volume fraction of nanoparticles are studied. SiO₂–TiO₂ nanoparticles are synthesized by applying both ultra-sound irradiation and sol–gel methods. Morphology and size of nanostructures are portrayed through the exact use of scanning electron microscopy, while the phase of the product is investigated by an X-ray diffraction pattern (XRD). The findings indicate that as the mass flow enhances, the heat transfer coefficient rises. The heat transfer coefficient and pressure drop have increased by using a helical fin. Regarding the oil-refrigerant mixture, the heat transfer coefficient augments at low vapor quality and reduces at high vapor quality. By adding nanoparticles, heat transfer increases, but a decreasing trend in heat transfer is observed from a certain vapor quality. The highest percentage of increase in heat transfer at a mass velocity of 380 kg/m².s is for the case with a fin and a mixture of R134a/nano oil, and this amount is equal to 89%.

本研究通过实验研究了 R134a/纳米油混合物在具有铝制螺旋翅片的水平对齐管中强制对流沸腾的传热。研究了各种参数的影响，包括制冷剂质量流量、蒸汽质量、星形翅片、油浓度和纳米颗粒的体积分数。SiO ₂ –TiO ₂纳米粒子是通过应用超声辐射和溶胶-凝胶方法合成的。纳米结构的形态和尺寸通过精确使用扫描电子显微镜进行描绘，而产品的相通过 X 射线衍射图 (XRD) 进行研究。研究结果表明，随着质量流量的增加，传热系数增加。使用螺旋翅片提高了传热系数和压降。对于油-制冷剂混合物，传热系数在蒸汽质量低时增加，在蒸汽质量高时降低。通过添加纳米颗粒，传热增加，但从一定的蒸汽质量观察到传热减少的趋势。质量速度为 380  kg/m ^{2 时}传热增加的最高百分比.s 是针对带有翅片和 R134a/纳米油混合物的情况，该量等于 89%。