Published 8 issues per year
ISSN Print: 1065-5131
ISSN Online: 1563-5074
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2.3
5-Year IF:
1.8
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0.2
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0.00037
JCI:
0.6
SJR:
0.433
SNIP:
0.593
CiteScore™::
4.3
H-Index:
35
Indexed in
Development and Testing of a Novel, Variable-Roughness Technique to Enhance, On Demand, Heat Transfer in a Single-Phase Heat Exchanger
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ABSTRACT
A novel enhancement concept involves a variable-roughness heat-exchanger-tube insert that can repeatedly fluctuate between enhanced and unenhanced heat transfer states. The desired response of the heat-exchanger-tube insert is dictated by an excessive tube-wall temperature. A well-known correlation for the heat transfer coefficient due to roughness in turbulent pipe flows was applied to the tube-side of a double-pipe heat exchanger. This correlation was used to determine the material deformation required to produce "effective" enhancement, a roughness change that would produce at least a 10°C reduction in tube-wall temperature. Shape-memory alloys (SMA's) can be used to develop a variable-roughness, heat-exchanger-tube insert that can respond to an excessive tube-wall temperature. The final design consists of Nickel Titanium (NiTi) shape-memory-alloy wire coils that ride along a support-structure insert in close proximity to the tube wall. At low temperature, the shape-memory coils are close-coiled and produce little heat transfer enhancement. In response to an excessive tube-wall temperature, the coil extends and produces substantial heat transfer enhancement. Experiments were conducted at three test-fluid flow rates [0.14 kg/s (18.52 lb/min), 0.30 kg/s (39.68 lb/min), 0.58 kg/s (76.72 lb/min)] while maintaining constant test-fluid inlet temperatures [30°C (86°F), 35°C (95°F), 40°C (104°F)]. Extension oftheSMA coils does produce heat transfer enhancement and a pressure drop penalty. The increase in heat transfer coefficient between compressed-coil and extended-coil states ranges from 28 to 64 percent. The corresponding increase in friction factor is between 18 and 25 percent.
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