Introduction

Sundén, Bengt; Fu, Junwei

doi:10.1016/b978-0-12-809760-1.00001-6

Cited by 6 publications

(8 citation statements)

References 6 publications

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“…It is generally acknowledged that thermal stimulation can trigger the molecular movement of particles, and results from propagation of the kinetic energy of vibrating molecules and the resulting increasing internal energy. 9–13 This phenomenon is believed to support various medical therapies. In past decades, thermal stimulation has been utilized directly for the medical treatments in pain relief, skin inflammation, edema, musculoskeletal injuries, soft tissue injuries, and pediatric swallowing disorders.…”

mentioning

confidence: 78%

Development of self-care textile wearables with thermally stimulated drug delivery function via biological and physical investigations

Cheung

2020

Textile Research Journal

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Previous studies have examined and verified the drug loading and releasing functionality from the interior channels of hollow fibers. An integrated design for self-care textile wearables with a thermally stimulated drug delivery function was proposed. To progress the in-depth development of the proposed self-care wearables, physical and biological investigations, including i) liquid release with thermal stimulation and ii) drug release upon thermal stimulation, were conducted. Physical investigation revealed that the concentration of dyes released from the heated specimens increased with higher temperature during the initial first hour of delivery. Moreover, higher cytotoxic effect could be induced with drugs delivered through heated specimens under higher thermal stimulated energy through biological examination. These results set up milestones for demonstrating the influence of thermal energy on different therapeutic requirements, such as rapid-onset transdermal medication.

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confidence: 78%

Development of self-care textile wearables with thermally stimulated drug delivery function via biological and physical investigations

Cheung

2020

Textile Research Journal

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“…To normalized Nusselt number, Nu 0 , which refers to Nusselt number in a smooth circular channel with fully developed turbulent flow, is introduced from Dittus–Boelter correlation (Sundén, 2012) and shown as: …”

Section: Computational Methods and Proceduresmentioning

confidence: 99%

“…Similarly, friction factor is also normalized by f 0 (Sundén, 2012), which is friction loss in smooth circular channel with fully developed turbulent flow: …”

Section: Computational Methods and Proceduresmentioning

confidence: 99%

Numerical analysis of heat transfer characteristics in a pin fin-dimpled channel with different pin fins and dimple locations

Yan

Luo

Zhang

et al. 2022

HFF

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Purpose This paper aims to investigate the influences of dimple location on the heat transfer performance of a pin fin-dimpled channel with upright/curved/inclined pin fins under stationary and rotating conditions. Design/methodology/approach Numerical methods based on a realizable k-ε turbulent model are used to conduct this study. Three kinds of pin fins (upright, curved, inclined) and three dimple locations (front, middle, behind) are studied for Ro varying from 0 to 0.5. Findings On the whole, pin fin plays a dominated role in heat transfer performance compared to dimple. The heading path and interaction of the longitudinal secondary flow and jet-like flow critically affect heat transfer performance. The formation, development and impingement of jet-like flow and longitudinal secondary flow are significantly affected by dimple locations. Dimple at behind position shows the poorest heat transfer enhancement. Originality/value This study is an extend of another previous study in which an innovative curved pin fin is proposed. The originality of this paper is to evaluate the heat transfer performance for the combined cooling structure of dimple and pin fin, which will provide original and useful application and experience for turbine blade design.

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“…The Nusselt number can be normalized using the Dittus – Boelter equation (Sundén, 2012). It characterizes fully developed internal turbulent flow in circular passages with smooth surfaces as: …”

Section: Computational Investigationmentioning

confidence: 99%

“…Also, the friction factor in the numerical simulation is calculated based on the distance between the two pressure transducers and the passage hydraulic diameter. It can be normalized by the Blasius equation for fully developed turbulent flow in a circular tube (Sundén, 2012): …”

Section: Computational Investigationmentioning

confidence: 99%

Influences of secondary flow induced by Coriolis forces and angled ribs on heat transfer in a rotating channel

Hoseinalipour

Shahbazian

Sundén

2019

Int Jnl of Num Meth for HFF

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Purpose The study aims to focus on rotation effects on a ribbed channel of gas turbine blades for internal cooling. The combination and interaction between secondary flows generated by angled rib geometry and Coriolis forces in the rotating channel are studied numerically. Design/methodology/approach A radially outward flow passage as an internal cooling test model with and without ribs is used to perform the investigation. Aspect ratio of the passage is 1:1. Square ribs with e/Dh = 0.1, p/e = 10 and four various rib angles of 90°, 75°, 60° and 45° are configured on both the leading and trailing surfaces along the rotating duct. The study covers a Reynolds number of 10,000 and Rotation number in the range of 0-0.15. Findings Nusselt numbers in the ribbed duct are 2.5 to 3.5 times those of a smooth square duct, depending on the Rotation number and rib angle. The maximum value is attained for the 45° ribbed surface. The synergy angle between the velocity and temperature gradients is improved by the angled rib secondary flows and Coriolis vortex. The decrease of the synergy angle is 8.9, 13.4, 12.1 and 10.1 per cent for the 90°, 75°, 60° and 45° ribbed channels with rotation, respectively. Secondary flow intensity is increased by rotation in the 90° and 75° ribbed ducts and is decreased in 45° and 60° ribbed cases for which the rib-induced secondary flow dominates. Originality/value The primary motivation behind this work is to investigate the possibility of heat transfer enhancement by vortex flow with developing turbulence in the view point of the field synergy principle and secondary flow intensity.

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Introduction

Cited by 6 publications

References 6 publications

Development of self-care textile wearables with thermally stimulated drug delivery function via biological and physical investigations

Development of self-care textile wearables with thermally stimulated drug delivery function via biological and physical investigations

Numerical analysis of heat transfer characteristics in a pin fin-dimpled channel with different pin fins and dimple locations

Influences of secondary flow induced by Coriolis forces and angled ribs on heat transfer in a rotating channel

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