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Energy efficiency in process industry – High-efficiency vortex (HEV) multifunctional heat exchanger

Ghanem, Akram; Habchi, Charbel; Lemenand, Thierry; … - In: Renewable Energy 56 (2013) C, pp. 96-104

In the process industry, vortex generators are being increasingly incorporated in modern multifunctional heat exchangers/reactors to enhance heat and mass transfer and thus increase energy efficiency. Longitudinal and transverse pressure-driven vortices and shear-instability-driven flow...

Persistent link: https://www.econbiz.de/10010806119

Local heat transfer and thermal performance on periodically dimple-protrusion patterned walls for compact heat exchangers

Hwang, Sang Dong; Kwon, Hyun Goo; Cho, Hyung Hee - In: Energy 35 (2010) 12, pp. 5357-5364

In this study, heat transfer and thermal performance of a periodically dimple-protrusion patterned surface have been … investigated to enhance energy-efficiency in compact heat exchangers. The local heat transfer coefficients on the dimple … applied to the bottom wall only or both the bottom and top walls in the test duct. The ratio of dimple (or protrusion) depth …

Persistent link: https://www.econbiz.de/10010807738

Multi-objective optimization of a cooling channel with staggered elliptic dimples

Kim, Hyun-Min; Moon, Mi-Ae; Kim, Kwang-Yong - In: Energy 36 (2011) 5, pp. 3419-3428

design variables, such as the elliptic dimple diameter ratio, ratio of the dimple depth to average diameter, and ratio of the …-optimal front with regard to the heat transfer and pressure loss, respectively, have spanwise and streamwise elliptic dimple shapes …

Persistent link: https://www.econbiz.de/10010808153

Numerical investigation of heat transfer and erosion characteristics for H-type finned oval tube with longitudinal vortex generators and dimples

Zhao, X.B.; Tang, G.H.; Ma, X.W.; Jin, Y.; Tao, W.Q. - In: Applied Energy 127 (2014) C, pp. 93-104

structures including bleeding dimples, longitudinal vortex generators (LVGs), and compound dimple-LVG. The simulation results … show that the oval tube with compound LVG-dimple achieves the highest overall heat transfer performance while the oval tube … on the first row of tubes together with hemisphere protrusions design, while the compound LVG-dimple on the rest tubes …

Persistent link: https://www.econbiz.de/10010776605

Heat and flow characteristics of air heater ducts provided with turbulators—A review

Alam, Tabish; Saini, R.P.; Saini, J.S. - In: Renewable and Sustainable Energy Reviews 31 (2014) C, pp. 289-304

The use of turbulators in different forms of ribs, baffles, delta winglets, obstacles, vortex generator, rings and perforated blocks/baffles is an effective way to improve the performance of heat exchangers and solar air heaters. Investigators studied the effect of these turbulators for heat...

Persistent link: https://www.econbiz.de/10011049411

Improving vortex tube performance based on vortex generator design

Farzaneh-Gord, Mahmood; Sadi, Meisam - In: Energy 72 (2014) C, pp. 492-500

The effect of vortex generator parameters (Cold orifice angle, Cold orifice diameter and Nozzle area) on vortex tube performance is investigated experimentally. Vortex tube is connected to a natural gas pipeline with constant pressure of 4 bars. To improve vortex tube efficiency, six generators...

Persistent link: https://www.econbiz.de/10011053099

Effects of vortex generators on a blunt trailing-edge airfoil for wind turbines

Gao, Linyue; Zhang, Hui; Liu, Yongqian; Han, Shuang - In: Renewable Energy 76 (2015) C, pp. 303-311

Vortex generators (VGs) are commonly-used effective flow separation control devices, and are proved to have potential to improve the aerodynamic performance of large wind turbines. In this paper, the flow physics of VGs and how their size affects the aerodynamic performance of a blunt...

Persistent link: https://www.econbiz.de/10011189923

Smart control of a horizontal axis wind turbine using dielectric barrier discharge plasma actuators

Jukes, Timothy N. - In: Renewable Energy 80 (2015) C, pp. 644-654

Rotating stall around a small-scale horizontal axis wind turbine was experimentally studied to characterize and assess smart rotor control by plasma actuators. Phase-locked Particle Image Velocimetry was used to map the flow over the rotor blade suction surface at numerous radial stations at a...

Persistent link: https://www.econbiz.de/10011263800

Laminar flow calculations in ducts of complex shapes using mapping functions and decomposition of domains

Normandin, Magdeleine; Clermont, Jean-Robert; Mahmoud, Ahmad - In: Mathematics and Computers in Simulation (MATCOM) 52 (2000) 1, pp. 21-39

The method presented in this paper, based on geometrical considerations, concerns the use of unknown transformations and decomposition of domains for computation of fully-developed flows in ducts of complex shape. The approach involves local one-to-one transformations of sub-domains of the...

Persistent link: https://www.econbiz.de/10010870124

Numerical study of evaporation by mixed convection of a binary liquid film

Nasr, Abdelaziz; Debbissi Hfaiedh, Chokri; Ben … - In: Energy 36 (2011) 5, pp. 2316-2327

This paper deals with a numerical analysis of the evaporation of binary liquid film. The film is falling down on one plate of a vertical channel under mixed convection channel. The first plate of a vertical channel is externally submitted to a uniform heated flux q1 while the second one (y=d) is...

Persistent link: https://www.econbiz.de/10010809672