Review Article
Advances in Nanofluid-Enhanced Pool and Flow Boiling Heat Transfer: A Comprehensive Review
Issue:
Volume 11, Issue 4, August 2026
Pages:
57-80
Received:
24 March 2026
Accepted:
20 July 2026
Published:
17 August 2026
Abstract: Boiling heat transfer is an important thermal management mechanism in power generation, chemical processing, high-heat-flux electronics, refrigeration, nuclear reactors, and automotive systems because it enables large heat removal at comparatively small temperature differences. Nanofluids have emerged as promising working fluids for further improving boiling performance; however, published results remain highly scattered because critical heat flux and heat transfer coefficient depend simultaneously on nanoparticle composition, concentration, stability, surface condition, heater material, mass flux, pressure, vapor quality, and flow regime. This review addresses this gap by critically comparing experimental studies on nanofluid-enhanced pool and flow boiling and by organizing the available evidence according to working fluid, nanoparticle type, heater configuration, operating condition, HTC response, and CHF response. Al2O3 and TiO2 are the most extensively investigated nanoparticles, whereas CuO, SiO2, ZnO, Fe3O4, MgO, graphene oxide, carbon nanotubes, SiC, and graphite have also shown notable but condition-dependent performance. In pool boiling, reported CHF enhancements reach 200% for Al2O3 and TiO2, 117% for ZnO, 100% for Al2O3-TiO2 combinations, and 60% for SiO2, while HTC improvements include 43% for Fe3O4, 20 to 30% for CuO, 28.7% for carbon nanotubes, and 22% for ZnO. Additional studies report study-specific pool-boiling maxima of 145 to 245% in CHF for reduced-graphene-oxide/water and 75% in HTC for Al2O3/water on smooth surfaces. In flow boiling, CHF enhancements of 100% for graphene oxide, 70% for Al2O3, 35% for SiC, and 13% for Al2O3 Cu are reported, whereas HTC increases reach 126% for ZnO, 86% for Al2O3, 30% for CuO, 27.97% for TiO2, and 23.7% for MgO. The review shows that nanofluid boiling enhancement is governed by coupled fluid-surface-hydrodynamic interactions rather than thermal conductivity alone and identifies standardization, long-term stability, fouling, pressure-drop penalties, and predictive model validation as the principal unresolved challenges, requiring coordinated testing before reliable industrial implementation can be achieved across thermal systems and operating conditions.
Abstract: Boiling heat transfer is an important thermal management mechanism in power generation, chemical processing, high-heat-flux electronics, refrigeration, nuclear reactors, and automotive systems because it enables large heat removal at comparatively small temperature differences. Nanofluids have emerged as promising working fluids for further improvi...
Show More
Research/Technical Note
Design and Structural Verification of a Modular Multi-Level Aluminum Access Stair System for Maintenance and Construction Applications
Nikhilkumar Patel*
Issue:
Volume 11, Issue 4, August 2026
Pages:
81-92
Received:
20 July 2026
Accepted:
29 July 2026
Published:
20 August 2026
Abstract: Modular access towers are increasingly used in construction, industrial maintenance, rooftop servicing, and excavation applications where conventional scaffold stair systems may be limited by installation time, relocatability, available footprint, and project-specific fabrication requirements. This study develops and evaluates a configuration-aware structural verification framework for a multi-level aluminum access stair system assembled from repeatable welded and bolted modules. The objective is to determine whether modular stair-tower configurations can satisfy strength, stability, connection, and anchorage requirements under site-specific gravity and environmental loading while maintaining the flexibility required for repeated assembly and reconfiguration. The methodology combines three-dimensional finite-element analysis in SAP2000, code-based aluminum member checks, analytical utilization and reserve-factor calculations, and separate verification of bolts, welds, base anchors, and tie-off anchors. A primary Colorado installation was assessed for dead, live, snow, wind, and seismic actions using 6061-T6 aluminum members. A separate Florida installation was reviewed as an independent cross-project case under a higher basic wind speed of 168 mph. Controlled manufacturing drawings for standard and compact towers ranging from one to ten stair modules were also examined to evaluate the influence of module count, total height, structural mass, footprint, and tie-back spacing. All reported structural components satisfied the unity utilization criterion. The governing 3 in × 3 in × 0.25 in aluminum angle reached a utilization ratio of 0.941. The base-anchor and tie-off-anchor interaction ratios were 0.752 and 0.651, respectively. A two-bolt field connection provided 16.57 kips of shear capacity against a demand of 12.39 kips. The results show that structural adequacy depends not only on individual member strength but also on inter-module load-path continuity, anchorage, connection reliability, lateral-restraint spacing, and site-specific environmental actions. The proposed framework provides a transferable engineering basis for comparing configurable lightweight access structures and supports future parametric optimization and experimental validation.
Abstract: Modular access towers are increasingly used in construction, industrial maintenance, rooftop servicing, and excavation applications where conventional scaffold stair systems may be limited by installation time, relocatability, available footprint, and project-specific fabrication requirements. This study develops and evaluates a configuration-aware...
Show More
