Title:
CFD-based Optimization of Biomass Heat Exchanger Performance: Spacer Influence on Pressure Loss and Flow Behavior in Double-pipes
Author(s):
Jaseliūnaitė, J., Šeporaitis, M.
Document(s):
Paper
Poster
Abstract:
Double-pipe heat exchangers commonly employ internal spacers to maintain flow channel alignment in biomass energy systems. While essential for structural integrity, spacers can disrupt flow, increasing pressure drop and inducing recirculation—especially in systems handling viscous biofluids under transitional flow conditions. This study uses two-dimensional computational fluid dynamics simulations to investigate the hydrodynamic impact of 15 distinct spacer geometries. By systematically varying the front and back shapes of the obstacles, the study evaluates normalized pressure drop (.p/.) and recirculation zone length (Lr). Results show that elongated and streamlined back geometries significantly reduce or eliminate recirculation zones, while front modifications have a pronounced effect on pressure drop, with elongated triangular fronts proving particularly effective. Combined geometric optimizations yielded up to 71% reduction in .p/.. The best-performing designs (Cases 14 and 15) achieved both low resistance and minimal recirculation, demonstrating the critical role of spacer geometry in flow efficiency. These findings provide design guidance for more hydraulically efficient and sustainable heat exchanger systems in biomass applications.
Keywords:
CFD, pipe spacers, hydrodynamic performance
Topic:
Sustainability, Impacts, Policies and Systems Analysis
Subtopic:
Overall system analysis, decision making and IA uses
Event:
33rd European Biomass Conference and Exhibition
Session:
2BV.9.15
Pages:
418 - 420
ISBN:
978-88-89407-25-7
Paper DOI:
10.5071/33rdEUBCE2025-2BV.9.15
Price:
FREE
