Curved lancet pin-fin geometry effects on convective performance in microchannels
| dc.contributor.author | Kaewchoothong, Natthaporn | |
| dc.contributor.author | Oo, Ye Min | |
| dc.contributor.author | Gonsrang, Sarawut | |
| dc.date.accessioned | 2026-08-06T10:56:06Z | |
| dc.date.available | 2026-08-06T10:56:06Z | |
| dc.date.issued | 2026-07-01 | |
| dc.description.abstract | Efficient thermal management in compact cooling systems requires enhancement techniques that improve heat transfer while minimizing pressure penalties, particularly under transitional flow conditions. However, the effects of curvature-controlled pin-fin geometries in microchannel flows at moderate Reynolds numbers (Re = 1000–5000) remain insufficiently understood. In this study, a three-dimensional numerical investigation was conducted to evaluate the thermo-hydraulic performance of a microchannel heat sink equipped with curved lancet pin-fins. Four inclination angles (45°, 60°, 75°, and 90°) were systematically examined. A smooth channel was used as a baseline for comparison. The results showed that curvature-induced flow redirection significantly altered vortex structures, enhanced near-wall mixing, and suppressed large-scale wake regions. Among the tested configurations, the 45° case provided the best performance, increasing the area-averaged Nusselt number by up to 16.7% compared with the 90° case, while simultaneously reducing the friction factor by approximately 1.36%. As a result, the thermal performance factor improved by up to 16.9%, indicating a favorable balance between heat transfer enhancement and pressure loss. The novelty of this work lies in the systematic evaluation of curvature-angle effects on lancet-type pin-fins under transitional Reynolds-number conditions in confined microchannels. The findings provide new physical insight into curvature-controlled flow mechanisms and offer practical guidance for the design of compact cooling systems with improved thermo-hydraulic efficiency. | |
| dc.identifier.citation | International Communications in Heat and Mass Transfer, 176(P2), 2026 | |
| dc.identifier.doi | 10.1016/j.icheatmasstransfer.2026.111368 | |
| dc.identifier.issn | 07351933 | |
| dc.identifier.other | 2-s2.0-105037429710 | |
| dc.identifier.uri | https://dspace.kmitl.ac.th/handle/123456789/18252 | |
| dc.source | International Communications in Heat and Mass Transfer | |
| dc.subject | Curved lancet pin-fin | |
| dc.subject | Flow physics | |
| dc.subject | Gas turbine cooling | |
| dc.subject | Heat transfer enhancement | |
| dc.subject | Microchannel cooling | |
| dc.title | Curved lancet pin-fin geometry effects on convective performance in microchannels | |
| dc.type | Article |