Heat Transfer and Pressure Drop Characteristics in Straight Microchannel of Printed Circuit Heat Exchangers

Seo, Jang Won; Kim, Yoon Ho; Kim, Dong-Seon; Choi, Young Don; Lee, Kyu Jung

doi:10.3390/e17053438

Cited by 69 publications

(11 citation statements)

References 30 publications

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“…The pressure and temperature can be correlated in the vicinity of the saturation condition using Clapeyron-Clausius equation, which is defined as: dp dT " L T`v g´vl˘ ( 13) in which, L is the latent heat. In this view, the condensation and evaporation rate can be rewritten as:…”

Section: Phase Change Modelmentioning

confidence: 99%

Entropy Assessment on Direct Contact Condensation of Subsonic Steam Jets in a Water Tank through Numerical Investigation

Zhang

Tong

et al. 2016

Entropy

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Abstract:The present article analyzes the dissipation characteristics of the direct contact condensation (DCC) phenomenon that occurs when steam is injected into a water tank at a subsonic speed using a new modeling approach for the entropy generation over the calculation domain. The developed entropy assessment model is based on the local equilibrium hypothesis of non-equilibrium thermodynamics. The fluid flow and heat transfer processes are investigated numerically. To describe the condensation and evaporation process at the vapor-liquid interface, a phase change model originated from the kinetic theory of gas is implemented with the mixture model for multiphase flow in the computational fluid dynamics (CFD) code ANSYS-FLUENT. The CFD predictions agree well with the published works, which indicates the phase change model combined with the mixture model is a promising way to simulate the DCC phenomenon. In addition, three clear stages as initial stage, developing stage and oscillatory stage are discriminated from both the thermal-hydraulic results and the entropy generation information. During different stages, different proportion of the entropy generation rate owing to heat transfer, viscous direct dissipation, turbulent dissipation and inner phase change in total entropy generation rate is estimated, which is favorable to deeper understanding the irreversibility of DCC phenomenon, designing and optimizing the equipment involved in the process.

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Section: Phase Change Modelmentioning

confidence: 99%

Entropy Assessment on Direct Contact Condensation of Subsonic Steam Jets in a Water Tank through Numerical Investigation

Zhang

Tong

et al. 2016

Entropy

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“…A trend line was then generated from the simulation results for the first 6 layers. A linear relationship between pressure drop and flow rate might be expected for laminar flow through the channel areas, however the distribution and mix areas of the heat exchanger, as well as the inlet and outlet pipes, may experience turbulent flow, and other studies of micro-channel heat exchangers have observed a 2 nd order polynomial relationship between pressure drop and Reynolds number [22,23]. A 2 nd order polynomial relationship for pressure drop as a function of flow rate, generated from the results of the first 6 simulations, agreed with the results of the simulation for 7 layers, and was thus used to extrapolate to the full 32 layers.…”

Section: Heat Exchanger Pressure Drop Experiments and Simulation A Bementioning

confidence: 99%

Design, simulation, and testing of a novel micro-channel heat exchanger for natural gas cooling in automotive applications

Deng¹,

Menon²,

Lavrich³

et al. 2016

Preprint

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Micro-channel heat exchangers offer potential for a highly compact solution in heat transfer applications that have space limitations. Mobile applications such as automotive vehicles are one such area. This work presents the design, modeling, simulation and testing of a two-region micro-channel heat exchanger, employing both engine coolant and R134a, for use in an engine that compresses natural gas for on-board refueling at pressures up to 250 bar. The novel design of the micro-channel heat exchanger is presented. Numerical simulations were performed using ANSYS Fluent utilizing extrapolation techniques to estimate the pressure drop as a function of flow rate and symmetry methods to investigate heat transfer. Pressure drop was determined experimentally, and heat transfer was investigated through system tests employing the novel engine. Experimental results showed good comparison with corresponding numerical simulations which demonstrated the validity of the applied extrapolation and symmetry methods, enabling considerable reduction in computational cost. The pressure drop, flow distribution, and heat transfer characteristics of the heat exchanger are discussed.

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“…Several published articles have addressed some relevant experimental and computational issues associated with the performance of various channel shape configurations in heat exchangers, including straight channels 18,19 and zigzag channels 20–22 with design parameters like working fluids and temperature ranges. For example, Annesh et al 23 showed that the trapezoidal channels yielded the highest thermo‐hydraulic performance at the cost of the highest pressure drop in comparison with sinusoidal or triangular channels.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer performance comparison of printed circuit heat exchangers with straight, zigzag and serpentine flow channels for waste heat recovery

Xie

Chueh

Chen

et al. 2021

Intl J of Energy Research

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Summary In the present study, a printed circuit heat exchanger (PCHE) is investigated numerically by solving the steady‐state Navier–Stokes equations and energy equation. The PCHE is equipped with straight, wavy, and serpentine flow channels, allowing us to investigate the PCHE performance on a systematic basis of effectiveness and pressure drop between the inlet and outlet of the flow channels. Liquid water is utilized as a working fluid at temperatures of 30°C to 90°C, with geothermal heating rarely targeted for using water from hot springs. The numerical results are validated with experimental data, confirming that the shear stress transport (SST) turbulence model is suited for providing adequate accuracy. This study is intended to delve into several possible designs of PCHE's flow channels to reduce the pressure drop while increasing the effectiveness. Given the PCHE with 13 zigzag flow channels of the bending angle of 150°, the results show that the PCHE with the zigzag flow channels at a mass flow rate of 0.113 kg/s possesses significant heat transfer enhancement. When compared to the other two tested PCHEs (straight flow and serpentine flow passages), a 65% increase in effectiveness and a 39% rise in pressure drop are exhibited. The PCHE can be regarded as a recuperator of the Organic Rankine Cycle (ORC) and is generally thought to be an important part of maximizing the efficiency of the cycle. The favorable features of the zigzag PCHE make it possible to seamlessly integrate the zigzag PCHE into ORC as part of a waste heat recovery system in a feasible way to improve the ORC efficiency.

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Heat Transfer and Pressure Drop Characteristics in Straight Microchannel of Printed Circuit Heat Exchangers

Cited by 69 publications

References 30 publications

Entropy Assessment on Direct Contact Condensation of Subsonic Steam Jets in a Water Tank through Numerical Investigation

Entropy Assessment on Direct Contact Condensation of Subsonic Steam Jets in a Water Tank through Numerical Investigation

Design, simulation, and testing of a novel micro-channel heat exchanger for natural gas cooling in automotive applications

Heat transfer performance comparison of printed circuit heat exchangers with straight, zigzag and serpentine flow channels for waste heat recovery

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