Heat Transfer Effectiveness Characteristics Maps for Additively Manufactured Triply Periodic Minimal Surfaces Compact Heat Exchanger

  • Moza Ibrahim Al Teneiji

Student thesis: Master's Thesis

Abstract

Increased power density in modern miniaturized electronics caused difficulty in keeping electronic perform effectively. This challenge leads to the search for a high performance compact heat exchanger as one of the thermal management solutions. Conventionally manufactured heat exchangers had limitations that thwart the development of geometrically complex heat exchangers, which capable of exploiting topological aspects to enhance thermal performance. Subsequently, additive manufacturing (AM) is proposed as a powerful fabrication technique for compact heat exchangers based on the mathematically known triply periodic minimal surfaces (TPMS). In this work, we present 3D compact crossflow heat exchanger computational fluid dynamics (CFD) modeling of geometrically complex structures based on TPMS using the STARCCM+ CFD platform. Moreover, (CFD) modeling was used to obtain new Characteristics Maps that relate Heat Transfer Effectiveness (E) and Number of Transfer Units (NTU) for the proposed heat exchanger by varying cold stream flow rate, thermal resistance, heat capacity for water-water and air-air heat exchangers. The convection heat transfer coefficient (h), pressure drop (AP), and inlet and outlet fluid temperature (T) are all examined. The water-cooled car radiator as a dual-stream heat exchanger was verified. The Effect of surface roughness on heat transfer coefficient and pressure drop, maximum velocities in three-axis, and variable characteristic length on Reynolds number were investigated on the one-directional flow heat sink. Also, two different turbulence models were studied which are the realizable k-omega and the realizable k-epsilon. The results showed that the surface roughness affects the (h) more than (AP) in the Gyroid heat sink. We also found that the Reynolds number increased by increasing surface roughness. In comparison to the water-water heat exchanger, the air-air model performed effectively. However, the effectiveness of a Primitive heat exchanger is higher than a Gyroid heat exchanger at low NTU. Due to the ratio, both models achieved compactness.
Date of AwardJul 2021
Original languageAmerican English

Keywords

  • Compact Crossflow Heat Exchanger (CCHE) ; Additive Manufacturing (AM); Triply Periodic Minimal Surface (TPMS); Effectiveness (E); Number of Transfer Units (NTU)

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