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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

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

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

Viscous dissipation effect on entropy generation in curved square microchannels

Guo, Jiangfeng; Xu, Mingtian; Cai, Jun; Huai, Xiulan - In: Energy 36 (2011) 8, pp. 5416-5423

The viscous dissipation effect on the thermodynamic performance of the curved square microchannels in laminar flow is numerically investigated. The classical Navier–Stokes equations are adopted; aniline and ethylene glycol are selected as the working fluids. The results show that the heat...

Persistent link: https://www.econbiz.de/10010811378

Systematic analysis of the heat exchanger arrangement problem using multi-objective genetic optimization

Daróczy, László; Janiga, Gábor; Thévenin, Dominique - In: Energy 65 (2014) C, pp. 364-373

A two-dimensional cross-flow tube bank heat exchanger arrangement problem with internal laminar flow is considered in this work. The objective is to optimize the arrangement of tubes and find the most favorable geometries, in order to simultaneously maximize the rate of heat exchange while...

Persistent link: https://www.econbiz.de/10011053494

Characteristics of heat transfer and fluid flow in a channel with single-row plates array oblique to flow direction for photovoltaic/thermal system

Ali, Ahmed Hamza H.; Ahmed, Mahmoud; Youssef, M.S. - In: Energy 35 (2010) 9, pp. 3524-3534

This study has been carried out to investigate the characteristics of convective heat transfer and fluid flow for a single row of oblique plates array to the flow direction inside a channel. The flow inside the channel is laminar and the plates array have spanwise distance between the plates and...

Persistent link: https://www.econbiz.de/10011054203

Thermal analysis of novel minichannel-based solar flat-plate collector

Khamis Mansour, M. - In: Energy 60 (2013) C, pp. 333-343

This paper investigates thermal performance of a new design of minichannel-based solar flat-plate collector. The solar collector consists of an array of minichannels located in the absorber plate which is covered by single glass cover. Water was used as the working fluid. A numerical model was...

Persistent link: https://www.econbiz.de/10011054976

Laminar flow in circular tube with internal solidification of a binary mixture

Mahdaoui, M.; Kousksou, T.; Marín, J.M.; El Rhafiki, T.; … - In: Energy 78 (2014) C, pp. 713-719

Laminar flow heat transfer in circular tube with internal solidification of a binary mixture of paraffin is investigated numerically. The problem of the solidification process is formulated using the enthalpy–porosity based method. The influence of various parameters such as: wall temperature,...

Persistent link: https://www.econbiz.de/10011117614

An experimental study on vortex-generator insert with different arrangements of delta-winglets

Khoshvaght-Aliabadi, M.; Sartipzadeh, O.; Alizadeh, A. - In: Energy 82 (2015) C, pp. 629-639

Heat transfer enhancement in a tube using the VG (vortex-generator) insert with different arrangements of the delta-winglets is investigated. Fourteen VG inserts with the longitudinal and forward arrangement of the delta-winglets are made from the aluminum sheets with a length of 350 mm, a...

Persistent link: https://www.econbiz.de/10011209510