Effect of the Chevron Angle on Cooling Heat Transfer Characteristics of Supercritical Pressure Fluids in Plate Heat Exchangers

PurposeThe plate heat exchangers (PHE) with small size but large efficiency are compact types of heat exchangers formed by corrugated thin pressed plates, operating at higher pressures when compared to most other traditional exchangers. This paper aims to analyze heat transfer characteristics in the PHE experimentally and numerically.Design/methodology/approachComputational fluid dynamics analysis has been used to simulate the problem by using the ANSYS fluent 16 software. Also, the effect of using TiO2/water nanofluid as working fluid was investigated. TiO2/water nanofluid had 2% (Wt/Wt) nanoparticle content. To improve solubility of the TiO2nanoparticles, Triton X-100 was added to the mixture. The results have been achieved in different working condition with changes in fluid flow rate and its temperature.FindingsThe obtained results showed that using TiO2/water nanofluid improved the overall heat transfer coefficient averagely as 6%, whereas maximum improvement in overall heat transfer coefficient was 10%. Also, theoretical and experimental results are in line with each other.Originality/valueThe most important feature which separates the present study from the literature is that nanofluid is prepared by using TiO2nanoparticles in optimum size and mixing ratio with surfactant usage to prevent sedimentation and flocculation problems. This process also prevents particle accumulation that may occur inside the PHE. The main aim of the present study is to predict heat transfer characteristics of nanofluids in a plate heat exchanger. Therefore, it will be possible to analyze thermal performance of the nanofluids without any experiment.

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Dimensional analysis for the heat transfer characteristics in the corrugated channels of plate heat exchangers

International Communications in Heat and Mass Transfer ◽

10.1016/j.icheatmasstransfer.2006.12.002 ◽

2007 ◽

Vol 34 (3) ◽

pp. 304-312 ◽

Cited By ~ 33

Author(s):

J.H. Lin ◽

C.Y. Huang ◽

C.C. Su

Keyword(s):

Heat Transfer ◽

Dimensional Analysis ◽

Heat Exchangers ◽

Heat Transfer Characteristics ◽

Plate Heat ◽

Transfer Characteristics

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A 3-D Numerical Analysis of the Effect of Fin Pattern on the Thermo-Hydarulic Performance of Plate Heat Exchangers

Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer in Multiphase Systems; Heat and Mass Transfer in Biotechnology ◽

10.1115/ht2013-17131 ◽

2013 ◽

Author(s):

Kun-Hao Li ◽

Chi-Chuan Wang

Keyword(s):

Heat Transfer ◽

Pressure Drop ◽

Heat Exchangers ◽

Cfd Simulation ◽

Flow Distribution ◽

Heat Transfer Characteristics ◽

Effective Surface ◽

Plate Heat ◽

Transfer Characteristics ◽

Transfer Capability

This study numerically examines some commercially available plate patterns of plate heat exchangers using a 3-D CFD simulation. Detailed flow distribution and heat transfer characteristics subject to three different plate patterns are examined in this study. The plate pattern include GC26 and NT10 (double chevron) and SW26. The effective surface area of the associated plate patterns are 0.8671, 0.6808, and 0.6721 m2, respectively. The corresponding chevron angle are 33°, 64° (double chevron) and 61°, repectively. The calculated results show that the heat transfer efficient for NT10 is higher than that of GC26 by approximately 6.35% and is higher than SW26 by 10.3%. The results indicate that the heat transfer characteristics for the double chevron plate outperform that of the single chevron plate. On the other hand, the pressure drop is also increased with the double chevron as well as chevron angle. However, it is found that the double chevron design provides a better heat transfer capability subject to identical pressure drop.

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