In this paper, the effect of using turbulator and different oxides water based nanofluids on heat transfer characteristics of a straight tube have been investigated numerically based on empirical data. In the first part, the influence of SiO₂-water nanofluid concentration increment, ranging from 0.5 to 2 % volume fraction on the heat transfer coefficient and pressure drop has been investigated. The dynamic viscosity and thermal conductivity of studied fluids have been measured experimentally. The fluid's outlet temperature, overall heat transfer coefficient, pressure drop, and thermal performance were the important parameters which have been addressed. Numerical simulation has been done with the aid of finite volume method. According to the results, increase in Silica-water nanofluid concentration up to 2 % led to rise in heat transfer coefficient averagely by 7.93 %, pressure drop by 13.96 % and thermal performance by 4.2 %. In second section, heat transfer coefficient, pressure drop, and thermal performance of four different water based nanofluids in 2 % volume fraction containing Al₂O₃, CuO, TiO₂, and SiO₂ have been compared with each other. Results indicated that CuO-water nanofluid had better thermal performance among the other nanofluids by amount of 1.0632.

本文基于经验数据，对使用湍流器和不同氧化物的水基纳米流体对直管传热特性的影响进行了数值研究。第一部分，SiO ₂的影响研究了水纳米流体浓度增量，其传热系数和压降范围为0.5％至2％。已经通过实验测量了研究流体的动态粘度和导热率。流体的出口温度，总传热系数，压降和热性能是已解决的重要参数。借助有限体积法进行了数值模拟。根据结果​​，二氧化硅-水纳米流体浓度增加到2％导致平均传热系数增加7.93％，压降增加13.96％，热性能增加4.2％。在第二部分中，传热系数，压降，_比较了2 O ₃，CuO，TiO ₂和SiO ₂。结果表明，CuO-水纳米流体的热性能优于其他纳米流体，数量为1.0632。