Journal ArticleDOI
Thermal-hydraulic performance in a tube with punched delta winglets inserts in turbulent flow
TLDR
In this article , a punched delta winglet (PDW) was proposed and investigated numerically and experimentally in a turbulent flow, and the effect of delta winglets with different punching holes on heat transfer performance was studied.About:
This article is published in International Journal of Thermal Sciences.The article was published on 2022-02-01. It has received 17 citations till now. The article focuses on the topics: Wingtip device & Turbulence.read more
Citations
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Journal ArticleDOI
Numerical investigation of solar system equipped with innovative turbulator and hybrid nanofluid
TL;DR: In this article , the authors used horseshoe shape of fin with perforated tape at the bottom of pipe to improve the thermal efficiency of hybrid nano-powders.
Journal ArticleDOI
Performance optimization of a wavy finned-tube heat exchanger with staggered curved vortex generators
TL;DR: In this paper , a novel configuration of concave curved vortex generators is proposed for thermal performance enhancement in a wavy finned-tube heat exchanger, which can generate counter-rotated longitudinal vortices and enhance the heat transfer.
Journal ArticleDOI
Entropy generation and thermal performance of tubular heat exchanger fitted with louvered corner-curved V-baffles
TL;DR: In this article , a new louvered corner-curved winglet tape (LCBT) was proposed for improving performance of a uniform heat-flux tube equipped with a V-shaped LCBT arranged by V-tip in downstream direction with three baffle pitch ratios (P R = 1-2) and six louver angles (θ = 0-90°) for a fixed attack angle (α) of 30° and baffle height ratio (B R = 0.25).
Journal ArticleDOI
Effect of a unique winglet twisted tape insert on thermal and hydraulic properties of tubular heat exchanger
Abstract: ABSTRACT The present experimental investigation incorporates the winglet twisted tapes as an insert to determine the thermal and hydraulic performance of a heat exchanger tube. The purpose of connecting the winglet to the twisted tape is to improve the heat transmission while minimizing the pressure loss by not disrupting the flow at the core portion. The thermal performance of a heat exchanger with turbulent promoters is assessed by varying geometric factors, such as the size of the promoters, Twist ratio ( ), Winglet pitch ratio ( ), and Winglet height ratio ( ). Experiments were carried out for Reynolds numbers (Re) ranging from 3,000 to 21,000. For a set of geometric parameters, the greatest thermohydraulic performance achieved was 1.58. Regression analysis is used to build a statistical association for Nusselt number and friction factor and the anticipated data obtained is of acceptable accuracy. The entropy generation is expressed in the form of entropy generation number and the Bejan number to fetch the dominance of thermal or friction entropy using winglet twisted tape.
Journal ArticleDOI
Metaheuristics applied to the optimization of a compact heat exchanger with enhanced heat transfer surface
Alberto Menéndez-Pérez,Carlos Fernández-Aballí Altamirano,Daniel Sacasas Suárez,Cristian Cuevas Barraza,Rubén Borrajo-Pérez +4 more
TL;DR: In this paper , a combined geometry of louvered fins and vortex generators is numerically simulated to optimize the thermohydraulic behavior of a compact heat exchanger, and the influence of eight parameters of the enhanced surface on its performance is analyzed.
References
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Journal ArticleDOI
Two-equation eddy-viscosity turbulence models for engineering applications
TL;DR: In this paper, two new two-equation eddy-viscosity turbulence models are presented, which combine different elements of existing models that are considered superior to their alternatives.
Book ChapterDOI
Heat Transfer and Friction in Turbulent Pipe Flow with Variable Physical Properties
TL;DR: In this article, the authors discuss heat transfer and skin friction in turbulent pipe flow with variable physical properties and highlight analytical methods to describe heat transfer mechanisms for constant liquid properties quite satisfactorily and to take into account the influence of the variation of physical properties with temperature versus heat transfer.
Journal ArticleDOI
Vortices, Generators and Heat Transfer
TL;DR: In this paper, a survey on triangular and rectangular protrusions from a heat transfer surface which generate mainly longitudinal vortex systems is given on boundary layer and channel flow, either by themselves, or in a single row transverse to the flow direction.
Journal ArticleDOI
Numerical and experimental determination of flow structure and heat transfer effects of longitudinal vortices in a channel flow
TL;DR: In this article, the performance of a delta winglet type vortex generator in improving heat transfer in plate-fin crossflow heat exchangers has been evaluated in a fully developed laminar channel flow.
Journal ArticleDOI
Experimental investigations of heat transfer enhancement by plane and curved winglet type vortex generators with punched holes
Guobing Zhou,Zhizheng Feng +1 more
TL;DR: In this article, the performance of curved winglet VGs with and without punched holes was investigated using dimensionless numbers, and the results showed that the hole punched at lower position in vertical direction and at the centerline of lateral direction presents better heat transfer enhancement and thermohydraulic performance.