An experimental investigation on heat transfer enhancement of sprayed wire-mesh heat exchangers

Fu, Yanchen; Wen, Jia; Zhang, Cuizhen

doi:10.1016/j.ijheatmasstransfer.2017.05.026

Cited by 24 publications

(6 citation statements)

References 29 publications

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“…From the CHT analysis, we found an optimal Reynolds number/mass flow where thermal e↵ectiveness reaches a maximum, see Figure 3, top & Figure 5. Studies made by Y. C. Fu et al [27] on wire-net structures of compact heat exchangers showed a similar trend for thermal e ciency. The Reynolds number based on microchannel inlet is calculated using Eq.…”

Section: Cht Results and Discussionmentioning

confidence: 53%

Numerical and experimental investigation of a wire-net compact heat exchanger performance for high-temperature applications

Joseph¹,

Delanaye²,

Nacereddine³

et al. 2019

Applied Thermal Engineering

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The objective of this paper is to have a detailed investigation of the microchannel performance of a complex wire-net compact heat exchanger and investigate its collector performance experimentally for a micro combined heat and power system. Localised turbulence can enhance the heat exchanger performance. Besides, this will increase the pressure losses also. Shifting the Reynolds critical to smaller Reynolds number by using perturbators will control the pressure losses and enhance the microchannel thermal e ciency. In this paper, we consider microchannels with wire-net perturbators. The wire-net micro heat exchanger is assembled as a stack of counterflow flow passages with optimised thickness separated by thin foils. A metallic wire-net mesh is inserted in the flow passages to provide the required sti↵ness and enhance the microchannel e ciency. A parametric study was conducted on various heat exchanger parameters to optimise the heat exchanger size, thermal e↵ectiveness and pressure losses for a micro-CHP system. Besides, a detailed investigation of the wire-net flow physics was made using a higher order Reynolds stress turbulence model to obtain the full velocity gradient tensor. This could detail the e↵ect of anisotropic flow physics in the isotropic wire-net microchannels. Lambda 2 criteria was implemented to investigate the flow mixing of the centrally convected non-disturbed mass flow. Furthermore, the analysis of the turbulence production terms provided a deeper insight into flow attachment and detachment near the wire-net intersections. The heat exchanger was experimentally tested, and it was found that the collector pressure losses are not su ciently low as compared to the microchannel pressure losses. The microchannel conjugate heat transfer thermal e↵ectiveness is in good agreement with the overall experimental e ciency.

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Section: Cht Results and Discussionmentioning

confidence: 53%

Numerical and experimental investigation of a wire-net compact heat exchanger performance for high-temperature applications

Joseph¹,

Delanaye²,

Nacereddine³

et al. 2019

Applied Thermal Engineering

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“…The secondary flow pushes the position of maximum total pressure , 40 where R e is the Reynolds number, r is the radius of the pipe, and R is the radius of curvature of the pipe axis. Most of the previous research 22,23,32,41 on the Nu number of the coiled tube was conducted at low Reynolds number and low temperature, while there was also some research on aviation kerosene in the coiled tube at high Reynolds numbers and high temperatures. The heat-transfer correlation of the coiled tube can be based on a general correlation for forced convection heat transfer, that is, the Dittus−-Boelter correlation as Nu o = 0.0243Re b 0.8 pr b 0.4 .…”

Section: Resultsmentioning

confidence: 99%

Secondary Flow Effect on Supercritical Kerosene Oxidation Deposition and Heat Transfer in a Coiled Tube

et al. 2022

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Deposition in fuel cooling systems remains a challenge to the development of active cooling technologies for air-breathing engines. We experimentally and numerically investigated the influence of the secondary flow and heat-transfer characteristics of supercritical kerosene in a coiled tube on oxidation deposition. A coiled heated tube reactor (3000 mm long, 23 cycles) under constant heat flux and flow rate was applied to simulate the conditions of the fuel side in the heat exchanger of an aero-engine cooling system. The coupling characteristics of coking distribution with the development of secondary flow were studied along the whole pipe. The dynamic pressure, temperature, and velocity were analyzed in two specific circular cross sections located in the bend of the tube. The secondary flows induced in the coiled tube greatly enhance the heat transfer and slightly decrease the deposition rate, resulting in linear wall temperature profiles and a uniform coking distribution along the tube compared to the long straight tube. There is no obvious heat-transfer enhancement or deterioration in the whole coiled tube. The modified heat-transfer correlation of the supercritical RP-3 in the coiled tube was fitted at different flow rates and heat fluxes with an error of ±10%.

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“…The results presented in Fu et al (2017), Fugmann et al (2017) and Välikangas et al (2018) showed that the recommended turbulence model to predict fluid-dynamic behavior of FTHX with flow manipulators or turbulators , for cases with Re⁡Dh≥500, is the Shear Stress Transport ( SST ) κ − ω turbulence model, that was developed by Menter (1994). On the other hand, it was found that the turbulence intensity can be enhanced by up to 80%, when the airflow is passing through the CM interior (Hall and Hiatt, 1996).…”

Section: Model Description and Mathematical Formulationsmentioning

confidence: 99%

A novel trussed fin-and-elliptical tube heat exchanger with periodic cellular lattice structures

Lotfi

Sundén

2022

HFF

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Purpose This study aims to computational numerical simulations to clarify and explore the influences of periodic cellular lattice (PCL) morphological parameters – such as lattice structure topology (simple cubic, body-centered cubic, z-reinforced body-centered cubic [BCCZ], face-centered cubic and z-reinforced face-centered cubic [FCCZ] lattice structures) and porosity value ( ) – on the thermal-hydraulic characteristics of the novel trussed fin-and-elliptical tube heat exchanger (FETHX), which has led to a deeper understanding of the superior heat transfer enhancement ability of the PCL structure. Design/methodology/approach A three-dimensional computational fluid dynamics (CFD) model is proposed in this paper to provide better understanding of the fluid flow and heat transfer behavior of the PCL structures in the trussed FETHXs associated with different structure topologies and high-porosities. The flow governing equations of the trussed FETHX are solved by the CFD software ANSYS CFX® and use the Menter SST turbulence model to accurately predict flow characteristics in the fluid flow region. Findings The thermal-hydraulic performance benchmarks analysis – such as field synergy performance and performance evaluation criteria – conducted during this research successfully identified demonstrates that if the high porosity of all PCL structures decrease to 92%, the best thermal-hydraulic performance is provided. Overall, according to the obtained outcomes, the trussed FETHX with the advantages of using BCCZ lattice structure at 92% porosity presents good thermal-hydraulic performance enhancement among all the investigated PCL structures. Originality/value To the best of the authors’ knowledge, this paper is one of the first in the literature that provides thorough thermal-hydraulic characteristics of a novel trussed FETHX with high-porosity PCL structures.

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An experimental investigation on heat transfer enhancement of sprayed wire-mesh heat exchangers

Cited by 24 publications

References 29 publications

Numerical and experimental investigation of a wire-net compact heat exchanger performance for high-temperature applications

Numerical and experimental investigation of a wire-net compact heat exchanger performance for high-temperature applications

Secondary Flow Effect on Supercritical Kerosene Oxidation Deposition and Heat Transfer in a Coiled Tube

A novel trussed fin-and-elliptical tube heat exchanger with periodic cellular lattice structures

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