Arrays of flow channels with heat transfer embedded in conducting walls. (August 2016)

• Record Type: Journal Article
• Authors: Bejan, A.; Almerbati, A.; Lorente, S.; Sabau, A.S.; Klett, J.W.
• Is Part Of: International journal of heat and mass transfer. Volume 99(2016:Aug.)
• Page Start: 504
• Page End: 511
• Publication Date: 2016-08
• Subjects: Constructal design -- Heat exchanger -- Array of channels -- Flow channel -- Square cross section -- Triangular cross section -- Multiple objectives -- Morphing; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2016.03.123
• Languages: English
• ISSNs: 0017-9310

Abstract

Graphical abstract: Highlights: The free search for arrays of flow channels with two objectives simultaneously. The two objectives are reduced thermal resistance and fluid flow resistance. Two elemental channels are considered: square and triangular. The two objectives are met better when the channel wall thickness is uniform. The triangular array meets the two objectives better than the square array. Abstract: Here we illustrate the free search for the optimal geometry of flow channel cross-sections that meet two objectives simultaneously: reduced resistances to heat transfer and fluid flow. The element cross section and the wall material are fixed, while the shape of the fluid flow opening, or the wetted perimeter is free to vary. Two element cross sections are considered, square and equilateral triangular. We find that the two objectives are best met when the solid wall thickness is uniform, i.e., when the wetted perimeters are square and triangular, respectively. We also consider arrays of square elements and triangular elements, on the basis of equal mass flow rate per unit of array cross sectional area. The conclusion is that the array of triangular elements meets the two objectives better than the array of square elements.