Lattice Structures for Heat Exchangers
Heat exchangers are used to convert solar energy absorbed in solar
collectors into potable (drinkable) water. Sa179 tubes Is a Leading Supplier
& Exporter Of ASTM A106 Pipe And ASME SA106 Pipe. Steel, copper,
bronze, stainless steel, aluminum, or cast iron can be used as heat
exchangers. Copper is usually used for solar heating systems since it is a good
thermal conductor and has a greater resistance to corrosion. In “compact” heat
exchangers, stainless steel is also common.
Self-supporting behavior is the most desired characteristic for
DFAM of cellular structures. In the present work, gyroid, star kagome and BCC
cellular structures are evaluated for self-supporting behavior using Materialize Magic’s software. The lattice designs of different sizes are 3D
printed and visually examined for defects. The lattice designs are introduced
into a smooth circular pipe. Conjugate heat transfer analysis is done for
different Reynolds numbers (1193–10736) to study heat transfer and pressure
drop characteristics. All the lattice designs show heat transfer enhancement
and higher pressure drop with respect to smooth pipe. Among all lattice
designs, gyroid shows the highest heat transfer enhancement and highest
pressure drop. A micro-scale cross-flow heat exchanger is constructed from a
hollow nickel micro lattice structure, which is fabricated by conform ally
electroplating nickel onto a sacrificial polymer micro-lattice formed from
self-propagating photopolymer waveguides.
The periodic unit cell of the hollow nickel micro lattice structure
tested here includes lattice members with a diameter <1 mm and a nominal
pore size <9 mm. The heat transfer performance of the micro-lattice-based
heat exchanger is analyzed in terms of thermal conductance per unit volume,
which is equal to the value of overall heat transfer coefficient multiplied by
surface area to volume ratio.
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