Heat Transfer Enhancement and Pressure-Loss Reduction for Fin-Surfaces of In-line Tube Bundle with a Single Front Row of Winglet Pairs.

Kwak, Kyung Min; Torii, Kahoru; Nishino, Koichi

doi:10.1299/jsmeb.45.910

Cited by 8 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This work addresses the natural properties, dynamic characteristics, in a heat exchanger with axial load. Most studies as [Kwak, Torii and Nishino (2002), Lorenzini and Giuliani (2002)] focused on the heat or flow problems in a heat exchangers. The dynamic behavior of such tubes or heat exchanger systems has been also studied [Velmurugana and Muralikannanb(2009), Eisinger (1994), Eisinger and Francis (1996), Taylor et al (1998) ] and they focused on the structure.…”

Section: Dynamic Properties Of Coupled Tube-array Structures With Thementioning

confidence: 99%

Dynamic Properties of Coupled Tube-Array Structures with the Axial Loads

Huang

Tseng

2016

Lat. Am. j. solids struct.

View full text Add to dashboard Cite

The tube-array structures coupled both with the fluid and the axial load is focused. In a heat exchanger, the tubes are frequently affected by cold and hot fluid shock waves. Thus, tubes are often found to be vibrated and even to be worn out. This vibration may not only alter the performance of the tubes but also introduce the damage in the heat exchanger. In this work, the dynamic properties of coupled tube-array structures with the axial loads are investigated. Futher, the tube-array structures in a heat exchanger, consisting of periodic cooling tubes are also considered to simulate as a coupled periodic structure system. It is found that each tube of the system is weakly coupled to the adjacent tube via water. By using the Galerkin method, the equations of the coupled system with the fluid effect can be derived. Numerical results reveal that the axial load and fluid effects may influence the dynamic properties of a fluid coupled tubearray structures system of a heat exchanger significantly.

show abstract

Section: Dynamic Properties Of Coupled Tube-array Structures With Thementioning

confidence: 99%

Dynamic Properties of Coupled Tube-Array Structures with the Axial Loads

Huang

Tseng

2016

Lat. Am. j. solids struct.

View full text Add to dashboard Cite

show abstract

“…The conflict between the authors persevered on the best geometrical parameters, as in the orientation of the VGs. For example, the best choice for the attack angle was determined as 40°, 27,28 30°, 30,31 20°, 33,34 and 15° 29,32 by the investigators. Other investigations include effect of nanofluid types on heat transfer enhancement 36 and entropy production 39 in heat exchangers fitted with VGs.…”

Section: Introductionmentioning

confidence: 99%

“…So far, the basic geometrical parameters investigated included angle of attack, [27][28][29][30][31][32] aspect ratio, 33,34 shape [35][36][37] , and thickness 38 of the VGs. The conflict between the authors persevered on the best geometrical parameters, as in the orientation of the VGs.…”

Section: Introductionmentioning

confidence: 99%

Thermal enhancement of triangular fins based on spanwise distance of vortex generators

Akcayoglu

Nazli

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

In this study, the influence of spanwise positions of vortex generators on the fin performance is determined numerically by considering global and local flow and heat transfer fields. The vortex generators are located on the inclined surfaces of equilateral triangular fins and the spanwise distances between them are altered as much as possible depending on the extents of the triangular duct. “RNG k-ɛ” turbulence model with “Enhanced wall treatment” option is determined as the best turbulence model to predict the flow fields inside the triangular fins with built-in vortex generators, for Reynolds number of 5000. It is found that the best performance is achieved when the spanwise distance between the common flow up and common flow down type vortex generator pairs and the triangular duct base are equal to 0.23 and 1.11 times the vortex generator length, respectively. The optimum spanwise distance between the vortex generators is determined as 0.88 times the vortex generator length. The determined values reinforced the secondary flow interactions including mixing of hot and cold fluids, generation of turbulence, swirling motion of vortices, and interaction of vortices with the main flow. The obtained results are useful in designing triangular heat exchangers with built-in delta-winglet type vortex generators.

show abstract

“…To a heat exchanger, an investigation on dynamics of a tube with the fluid is necessary, especially with the axial load. Most investigations on the heat exchangers as [3,4] only focused on the heat or flow problems. Only a few studies [5,6] turn their attentions into the dynamic behavior of such heat exchanger systems.…”

Section: Introductionmentioning

confidence: 99%

Vibration of a Tube with the Axial Loads and Fluid

Huang

Tseng

Kuang

2013

AMM

View full text Add to dashboard Cite

Vibration of a tube with the fluid and axial load is focused. In a heat exchanger, the tubes are frequently affected by external force and fluid shock waves. Thus, tubes are often found to be vibrated. This vibration may alter the performance of the tubes and global heat exchanger. That a heat exchanger system is weakly coupled as the each tube is coupled to the adjacent one through the fluid is found. To understand the global system dynamics, the dynamics of a tube must be investigated first. In this work, the dynamic properties of a tube with the axial loads are investigated. The Galerkin method employed, the equation of a tube with the fluid effect can be to derive. Numerical results reveal that the axial load and fluid effects may affect the dynamic properties of a tube with fluid significantly.

show abstract

Heat Transfer Enhancement and Pressure-Loss Reduction for Fin-Surfaces of In-line Tube Bundle with a Single Front Row of Winglet Pairs.

Cited by 8 publications

References 6 publications

Dynamic Properties of Coupled Tube-Array Structures with the Axial Loads

Dynamic Properties of Coupled Tube-Array Structures with the Axial Loads

Thermal enhancement of triangular fins based on spanwise distance of vortex generators

Vibration of a Tube with the Axial Loads and Fluid

Contact Info

Product

Resources

About