Measurement of heat transfer coefficient and pressure drops in a compact heat exchanger with lance and offset fins for water based Al2O3 nano-fluids

Chennu, Ranganayakulu; Veeredhi, Vasudeva Rao

doi:10.1007/s00231-019-02707-w

Cited by 10 publications

(2 citation statements)

References 30 publications

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“…Ray et al [151] obtained the preliminary correlation between Nu and friction coefficient of nanofluid flow in compact miniature tube-plate heat exchanger through the experiment of 0.5 vol.% Al 2 O 3 nanofluid. In addition to the research on Al 2 O 3 -H 2 O nanofluids in the above-mentioned compact heat exchanger, other scholars have studied the characteristics of nanofluids in PCHE [152,153] and compact heat exchangers with spears and offset fins [154] and obtained some similar conclusions. These works laid a foundation for further research of Al 2 O 3 -H 2 O nanofluids used in compact heat exchanger.…”

Section: Nanofluidmentioning

confidence: 88%

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

Liao

Zhang

et al. 2021

Energies

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Heat exchangers play an important role in power, the chemical industry, petroleum, food and many other industrial productions, while compact heat exchangers are more favored in industrial applications due to their high thermal efficiency and small size. This paper summarizes the research status of different types of compact heat exchangers, especially the research results of heat transfer and pressure drop of printed circuit heat exchangers, so that researchers can have an overall understanding of the development of compact heat exchangers and get the required information quickly. In addition, this paper summarizes and analyzes several main working fluids selected in compact heat exchangers, and puts forward some discussions and suggestions on the selection of working fluids. Finally, according to the existing published literature, the performance evaluation indexes of compact heat exchangers are summarized and compared, which is convenient for developers and researchers to better grasp the design direction.

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Section: Nanofluidmentioning

confidence: 88%

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

Liao

Zhang

et al. 2021

Energies

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“…An unvarying heat flux of 122 Wcm −2 is imposed at the base surface of the IMCH to epitomize what is obtainable in avionics systems 53 and other recent high‐end electronic modules. The remaining external walls are assumed adiabatic with no convection or radiation heat transfer with the immediate environment and the temperature at the inlet of the microchannel is taken to be 293 K. The nanofluids flow through the microchannel from the inlet at an initial velocity,

{\vec{u}}_{o}

and exits the outlet at atmospheric pressure,

p_{o}

.…”

Section: Modelsmentioning

confidence: 99%

Thermohydraulic and entropy characteristics of Al₂O₃‐water nanofluid in a ribbed interrupted microchannel heat exchanger

et al. 2020

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In this study, an interrupted microchannel heat sink with rib turbulators was studied for its thermohydraulic effectiveness and entropy generation in a compact space. The rib edges are modified to enhance the overall functioning of the system by reducing the pressure drop. The working fluid used was Al2O3‐water nanofluid, and increasing the Reynolds number and nanoparticle concentration triggered a reduction in the heat sink's maximum temperature. These also offer a decrease in resistance to heat transfer, and there is an improvement in the evenness of the temperature of the interrupted microchannel heat sink, as regions with the likelihood of hot spot reduced drastically. At Re = 100, increasing the nanoparticle concentration from 0% to 4% enhanced the heat transfer coefficient by 38.41% for the interrupted microchannel heat sink‐base (IMCH‐B) configuration. Under similar conditions, the convective heat transfer coefficient for the interrupted microchannel heat sink‐fillet (IMCH‐F) increased by 43.69%. Furthermore, at 0.5% concentration, changing the Reynolds number from 100 to 700 augmented the heat transfer coefficient by 70.65%. Thus, the maximum temperature of the substrate's bottom surface was reduced by 53.83°C when the system was operated at Re = 700 and nanoparticle concentration of 4%. The IMCH‐C also showed relatively close results at all observed volume fractions. For the IMCH‐C, the maximum temperature of the bottom surface was reduced by 41.98°C at Re = 700 when compared with Re = 100% and 4% concentration. Although at high Reynolds numbers and concentrations, the pressure drops are higher, the performance enhancement criteria prove that the nanofluid is superior to water and the edge modifications show significant performance improvement. More importantly, the IMCH‐F heat sink showed the optimum performance based on the performance evaluation criteria at Re = 300 and φ=2% (ie, at this point, the heat transfer coefficient is maximum and the pressure drop is minimum). On the other hand, the optimal thermodynamic performance was observed at Re = 700 and φ=4%. The numerical results demonstrated a potential way to exploit nano‐suspensions for thermal applications, especially for high‐energy flux systems with compact space constraints.

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Review on Enhancement of Thermal Capacity in Heat Exchangers with Various Nanofluids

Kumari¹,

Pandey²,

Bapu³

2022

Lecture Notes in Mechanical Engineering

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Measurement of heat transfer coefficient and pressure drops in a compact heat exchanger with lance and offset fins for water based Al2O3 nano-fluids

Cited by 10 publications

References 30 publications

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

Thermohydraulic and entropy characteristics of Al₂O₃‐water nanofluid in a ribbed interrupted microchannel heat exchanger

Review on Enhancement of Thermal Capacity in Heat Exchangers with Various Nanofluids

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Measurement of heat transfer coefficient and pressure drops in a compact heat exchanger with lance and offset fins for water based Al2O3 nano-fluids

Cited by 10 publications

References 30 publications

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

Thermohydraulic and entropy characteristics of Al2O3‐water nanofluid in a ribbed interrupted microchannel heat exchanger

Review on Enhancement of Thermal Capacity in Heat Exchangers with Various Nanofluids

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Thermohydraulic and entropy characteristics of Al₂O₃‐water nanofluid in a ribbed interrupted microchannel heat exchanger