Applications are related to heat transfer on finned electric motors, automotive radiator, nanoparticle thermal performance, flow and heat transfer on sloped, rough surfaces, one-dimensional and two-dimensional radial fin models using the Integral Transform Technique and Frobenius Method, applying the Hardy Cross Method to solve water supply networks and designing a subsonic wind tunnel. Finned Electric Motors: an important industrial application of extended surfaces, fins, occurs in electric motors. Electric motors are of vital importance in the industry as they are used in machines of all types, including, for example, computer ventilation and other electronic equipment. Compact Heat Exchangers: the growing need for technological advances in automotive vehicles demands research that can increase heat exchange efficiency in many of its components. Thermal control of vehicle engines is achieved through finned radiators, classified as Compact Heat Exchangers. External Boundary Layer: the main objective of the analysis is to review and discuss the principles of the similarity method applied to the boundary layer on inclined surfaces. Results are obtained for the hydrodynamic and thermal fields, such as coefficient of friction and Stanton number, as a function of the pressure gradient parameter and the Prandtl number. Internal Turbulent Flow: The analytic nature of the solution methodology here utilized the integral transform technique, associated to two-distinct solution procedure for fully developed turbulent flow, allowed to isolate the turbulent Prandtl number as main source of discrepancies between measured and calculated values for the Nusselt number. Nanoparticle Thermal Performance: Theoretical thermohydraulic performance analysis of a compact heat exchanger, type finned flat tube, used in automotive radiators is performed in based-water nanofluids. The theory of effectiveness (e-NTU), and experimental data for water flow, are used for comparison. The [...]