A Numerical Investigation of the Thermal Performance of a Double Pipe Heat Exchanger with Copper Foam Baffles

Zuhair S Faal, Abbas J Jubear, Hussein R Al-Bugharbee

Abstract


Research on the enhancement of heat dissipation in heat exchangers using metallic foam still attracts the interest of the researchers’ community. In the present study, the thermal performance of a double-pipe heat exchanger (DPHX) with a copper foam (CF) baffle inside is investigated numerically. Water is utilized as operating fluid in both pipes with parallel flow. Numerical simulation includes building the geometry to the heat exchanger and proposing the suitable dimensions, and open cell copper foam properties such as the pore density (PPI). This simulation examines the effect of metallic foam with porosity (0.9) on the heat exchanger performance. This is conducted by comparing different configurations of foam baffles inside the heat exchanger pipe. This includes a filled pipe heat exchanger with copper foam (HXFF) and partially baffles cases. In the partially filled cases, nine foam rings were proposed to be inserted inside the heat exchanger outer pipe. These rings are represented in different configurations including complete disks and rings with removed sectors of angle (?) oppositely. The angle (?) has two values  90° and 180°, the effect of pore density is also investigated by changing its value from 10 to 50PPI.  The results explained that the heat transfer rate (Qave) and Nusselt number (Nuave) increase with increasing PPI and decrease of angle ?. Enhancement in (Qave) and (Nuave) was (45%) and (146%) respectively in a heat exchanger at (?) (180°) with (40PPI). Similarly, the pressure drop (?p) and the friction factor follow the same behavior, and the study included a comparison of the heat exchanger in the best configuration with (HXFF) and the heat exchanger without copper foam (HXOF).


Keywords


Heat transfer enhancement; metal foam; performance evaluate criteria (PEC)

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v15i3.14870.g9099

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