Residual stresses (RSes) induced by turning processes have a great effect on the material properties of the machined components and their abilities to withstand severe loading conditions (creep, fatigue, and stress corrosion cracking). The final state of RSes in a workpiece depends on its material and on the employed cutting parameters/conditions such as cutting speed, depth of cut, feed speed, cutting tool geometry, wear of the tool, cutting tool geometry, cutting tool coating, and cooling. This study introduces a comprehensive investigation of the effects of different cutting parameters, such as cutting speed (30, 60, and 90 m/min), feed (0.05, 0.1, and 0.3 mm/rev), and depth of cut (0.1, 0.5, and 1 mm) as well as cutting tool geometry such as cutting tool nose radius (0.397, 0.794, and 1.191 mm), and cutting tool coating (coated and uncoated) on the cutting force, maximum cutting temperature, surface microstructure, and surface residual stresses during cutting AISI 1035 alloy steel. The RSes were measured using X-ray diffraction technique. The experiments were designed using Taguchi method based on L 18 orthogonal array, and the significance level of different cutting parameters as well as cutting tool properties have been determined via applying analysis of variance. Numerical simulations have been carried out using commercial machining software AdvantEdge.

The current study focused on statistically investigating nanofluids' turbulent flow and rate of heat transfer in double pipe heat exchanger with rod inserts. Through the use of numerical simulation, the effects which the various kinds of nanofluids have on the enhancement of heat transfer using finite volume method (FVM) are studied. An application of homogeneous heat flux is made to the tube wall. More so, an examination of the effect of three varying slant angles of rod insert (α = 25°, 30°, 45°) was carried out at varying Reynolds number ranging from 7500 -20000. The statistical results revealed that the coefficient of transferring heat in the tube containing rod inserts is higher than that of the smooth tube. In addition, results also showed that when rod insert are used in double pipe heat exchanger to augment the Nusselt number increases the slant angle. The max value of Nusselt number was demonstrated at the angle 45° of rod insert. Through the use of the rod inserts at (α=45°) and (S = 30mm), the coefficient of maximal skin friction was determined because of the resistance of larger flow. The maximal value of the Performance Evaluation Criteria (PEC) was mentioned in the case of min slant angle of (α = 25°) and the pitch distance of S = 30 mm.

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