![Sample our Engineering & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5933/TOC-Subject-Sample-2021-Engineering-Tech.jpg"})
ABSTRACT
The PCHE has been recognized as a promising heat exchanger for hypersonic precooled aero-engines due to its superior thermal performance, high compactness and robustness. The present work focuses on the experimental thermal-hydraulic performance study of a novel zigzag microchannel PCHE. The results indicate that the pressure loss caused by friction is the main source. The Fanning correlation proposed by Moisseysev shows more precise prediction results, whose prediction deviations are within 10.0%. The measured Nu is markedly 1.24 ~ 1.94 times higher than that of the straight channel and a new Nu correlation was developed and the maximum deviations do not exceed 5%.
Disclosure statement
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Nomenclature
| = | channel width, mm | |
| = | channel depth, mm | |
| = | plate width, mm | |
| = | fin thickness, mm | |
| = | hydraulic diameter, mm | |
| = | wall thickness, mm | |
| = | normalized fin thickness | |
| = | defined dimensionless number | |
| = | heat transfer area, | |
| = | cross area, | |
| = | channel length, | |
| P | = | pressure, |
| = | temperature, | |
| = | pressure drop, | |
| = | Temperature difference | |
| U | = | overall heat transfer coefficient |
| = | form loss coefficient | |
| = | heat transfer rate, | |
| = | mass flow rate, | |
| = | mass flow flux, | |
| = | density, | |
| k | = | thermal conductivity, |
| = | dynamic viscosity, | |
| = | pitch length, mm | |
| = | number of pitch | |
| = | number of sheet | |
| = | number of channels per sheet | |
| = | specific heat capacity at constant pressure | |
| D | = | diameter of manifold |
| Re | = | Reynolds number |
| Nu | = | Nusselt number |
| = | Fanning friction factor | |
| = | power-weight ratio | |
| = | Prandtl number |
Greek letters
| = | effectiveness | |
| nf | = | fin efficiency |
| = | overall fin surface efficiency | |
| α | = | heat transfer coefficient, |
| θ | = | pitch angle, mm |
Subscripts
| = | inlet | |
| = | outlet | |
| = | hot side | |
| = | cold side | |
| W | = | metal wall |
| = | log mean temperature difference | |
| = | maximum | |
| min | = | minimum |
| = | heat exchanger core |
Abbreviations
| = | Number of Transfer Units | |
| = | printed circuit heat exchanger |