The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
A. M. Terekh - One of the best experts on this subject based on the ideXlab platform.
-
A generalized method for calculating convective heat transfer with cross flow over tube banks having external annular and coil-tape finning
Thermal Engineering, 1993Co-Authors: E. N. Pis'mennyi, A. M. TerekhAbstract:A comprehensive method for calculating heat transfer in tube bundles with cross annular and coil-tape finning was developed at the Kiev Polytechnical Institute after examining the heat-transfer characteristics of staggered tube banks. We experimented with 25 in-line steel tube banks and varied the finning coefficient, the relative cross Spacing, and the Longitudinal Spacing. When conducting the experiments in an open aerodynamic stand, we found average-surface convective heat-transfer coefficients from measurements of the temperature field of the finning and the walls of the tube
E. N. Pis'mennyi - One of the best experts on this subject based on the ideXlab platform.
-
A generalized method for calculating convective heat transfer with cross flow over tube banks having external annular and coil-tape finning
Thermal Engineering, 1993Co-Authors: E. N. Pis'mennyi, A. M. TerekhAbstract:A comprehensive method for calculating heat transfer in tube bundles with cross annular and coil-tape finning was developed at the Kiev Polytechnical Institute after examining the heat-transfer characteristics of staggered tube banks. We experimented with 25 in-line steel tube banks and varied the finning coefficient, the relative cross Spacing, and the Longitudinal Spacing. When conducting the experiments in an open aerodynamic stand, we found average-surface convective heat-transfer coefficients from measurements of the temperature field of the finning and the walls of the tube
S. D. Gao - One of the best experts on this subject based on the ideXlab platform.
-
local and average heat mass transfer over a flat tube bank fin mounted in line vortex generators with small Longitudinal Spacing
Journal of Enhanced Heat Transfer, 2002Co-Authors: Liang-bi Wang, Yong-heng Zhang, S. D. GaoAbstract:The local and average heat transfer characteristics over a flat tube bank fin mounted with in-line vortex generators (VGs) with small Longitudinal Spacing (six VGs per tube) have been studied by using the analogy of heat and mass transfer. Three rows of flat tube and several types of surfaces involved in heat transfer process such as fin surface mounted with VGs, its back surface (mounted without VGs), and flat tube surface are considered. The effects of the fin Spacing and VG parameters such as height and attack angle on heat transfer and pressure drop are investigated. The heat transfer performances of flat tube bank fin element mounted with VGs are compared with that without VG enhancement under three constraints. The correlations of Nusselt number and friction factor are given out. The results reveal that VGs can greatly enhance the heat transfer in the region near flat tube on the fin surface mounted with VGs, and in the region away from flat tube wall with some distance on the back surface of the fi...
-
Local and Average Heat/Mass Transfer over a Flat Tube Bank Fin Mounted In-Line Vortex Generators with Small Longitudinal Spacing
Journal of Enhanced Heat Transfer, 2002Co-Authors: Liang-bi Wang, Yong-heng Zhang, S. D. GaoAbstract:The local and average heat transfer characteristics over a flat tube bank fin mounted with in-line vortex generators (VGs) with small Longitudinal Spacing (six VGs per tube) have been studied by using the analogy of heat and mass transfer. Three rows of flat tube and several types of surfaces involved in heat transfer process such as fin surface mounted with VGs, its back surface (mounted without VGs), and flat tube surface are considered. The effects of the fin Spacing and VG parameters such as height and attack angle on heat transfer and pressure drop are investigated. The heat transfer performances of flat tube bank fin element mounted with VGs are compared with that without VG enhancement under three constraints. The correlations of Nusselt number and friction factor are given out. The results reveal that VGs can greatly enhance the heat transfer in the region near flat tube on the fin surface mounted with VGs, and in the region away from flat tube wall with some distance on the back surface of the fi...
S F Khaligh - One of the best experts on this subject based on the ideXlab platform.
-
analysis on performance of nanofluid cooled vortex generator channels with variable Longitudinal Spacing among delta winglets
Applied Thermal Engineering, 2017Co-Authors: M Khoshvaghtaliabadi, Z Baneshi, S F KhalighAbstract:Abstract The current article presents details of an experimental study to investigate the effect of variable Longitudinal Spacing among delta-winglets in vortex-generator (VG) channels. Four different classes of the VG channels are fabricated and tested in a wide range of the Reynolds number from 4000 to 10,000. Working fluids are selected to be water and Al2O3/water nanofluid (NF) containing low mass fractions (0.1% and 0.3%) of α-Al2O3 nanoparticles with the average size of 30 nm. In order to validate the current experiments, the preliminary results of a smooth channel using water are compared with some well-known correlations, and an acceptable compliance is obtained. The main results disclose a good improvement in the thermal performance of smooth channel by using the proposed arrangements of delta-winglets. It is found that the heat transfer coefficient is enhanced by 10–50% for water as working fluid. In addition, the NF flow improves the thermal performance by 8.5–17.6% with respect to water flow in expense of increasing the pressure drop by 5.4–9.3%. Finally, the maximum value for the overall hydrothermal performance factor of VG channels is around 1.41%. Furthermore, the use of NFs can improve the overall hydrothermal performance factor by 54%.
Vincenzo Fioravante - One of the best experts on this subject based on the ideXlab platform.
-
A method for designing the Longitudinal Spacing of slope-stabilising shafts
Acta Geotechnica, 2018Co-Authors: Raffaele Di Laora, Vincenzo FioravanteAbstract:The work at hand deals with the design of the Longitudinal Spacing among rows of closely spaced large-diameter shafts used to stabilise a precarious slope. The problem under consideration is idealised through a conceptual framework where an unstable mass of an infinitely long slope pushes a stable portion of soil adjacent to shafts, leading to failure along a slip surface passing through the upper end of the reinforcement elements. By exploiting the upper bound theorem of plastic collapse, a closed-form solution is derived for the load required for the failure of the stable mass as a function of geometrical and mechanical parameters of the slope and the soil. Results are validated through physical model tests by means of geotechnical centrifuge. Given the satisfactory agreement between analytical and experimental results, the model is extended to evaluate the safety conditions of the reinforced slope.
