Advances in Heat Transfer (Volume 53)

Description

Advances in Heat Transfer, Volume 53 in this long-running serial, highlights new advances in the field, with this new volume presenting interesting chapters written by an international board of authors. Cover Copyright_2021_Advances-in-Heat-Transfer Copyright List-of-contributors_2021_Advances-in-Heat-Transfer List of contributors Chapter-One---Advances-in-vapor-chambers-and-phase-c_2021_Advances-in-Heat-T Advances in vapor chambers and phase change heat spreaders Introduction Vapor chamber concept Vapor chamber applications Fundamentals Surface tension Laplace-Young equation Saturation pressure Contact angle Thin film evaporation Heat transport limitation Capillary limitation Maximum capillary pressure Liquid pressure drop Vapor pressure drop Maximum capillary heat transport Boiling limit Sonic limit Thermal resistance Effectiveness of a vapor chamber Advanced wicking structures Sintered particles Sintered meshes and foams Microgrooves Hybrid wicks with micro/nanostructures Wicks with spacers Others Hybrid wicks Wicked paths Radial artery Jumping drop Acknowledgment References Chapter-Two---Coating-engineering-for-boiling-heat-tra_2021_Advances-in-Heat Coating engineering for boiling heat transfer toward immersion cooling Introduction Fundamentals of nucleate boiling Boiling characteristics Bubble nucleation Bubble growth and departure Heat transfer mechanisms/models Heat flux due to natural convection (qnc) Heat flux due to transient heat conduction (qcond) Heat flux due to microlayer evaporation (qme) Heat flux due to transient micro-convection (qmc) Critical heat flux (CHF) mechanisms Hydrodynamic instability model Dry-spot model Force-balance model Coating technologies for pool boiling heat transfer Sintering Powder size and coating thickness Coating porosity Modulated coating geometry Electrochemical deposition Deposition period Current density Electrolyte solution concentration Electrolyte solution temperature Other factors Electrostatic and electrophoretic deposition Chemical/physical vapor deposition Spray technique Layer-by-layer assembly Mechanism analyses of coating-induced boiling enhancement Heat transfer enhancement Active nucleation site density (Na) Bubble dynamics Mechanistic heat transfer modeling Critical heat flux enhancement Capillary wicking (wickability) Revised force-balance model Modulated hydrodynamics instability Conclusions Acknowledgment References Chapter-Three---Vascular-systems-for-the-thermal-and_2021_Advances-in-Heat-T Vascular systems for the thermal and hygric management Introduction Radiant cooling Context Serpentines Constructal design Model Canopy-to-canopy vs serpentine designs Energy storage Context Analysis, scale of the system Temperature along an entrance channel Temperature at the system outlet Equipartition of imperfection Analysis, scale of the element Hierarchical elements Toward passive hygrothermal control Context Model Scale analysis Experiments, occupancy in winter conditions Concluding remarks References Chapter-Four---An-overview-on-the-role-of-wettability-and-_2021_Advances-in- An overview on the role of wettability and wickability as a tool for enhancing pool boiling heat transfer Historical background Boiling heat transfer Strategies of surface modification Surface roughening Manufacturing techniques Mechanisms Experimental results Effect of wettability and capillary wicking Effect of working fluid Effect of the pressure Porous surfaces Manufacturing techniques Mechanisms Experimental results Effect of particles size Effect of the pore-size, porosity and pore distribution Effect of pressure Working fluid effect Effect of the coating material Effect of the thickness of porous coating Micro and nanostructured surfaces Manufacturing techniques Mechanisms Experimental results Concluding remarks Acknowledgments References Chapter-Five---Review-of-advances-in-convective-heat-tran_2021_Advances-in-H Review of advances in convective heat transfer developed through additive manufacturing Introduction Metal printing methods and post-processing Printing methods Powdered metals and properties Design considerations and process parameters Part accuracy and surface morphology Heat transfer and friction factors for small channels Build orientation effects Print process parameters effects Correlations to predict performance for small additively manufactured channels Noncircular channel shapes Scaling friction factor and heat transfer for noncircular channel shapes Other types of microchannels and heat transfer augmentation surfaces Wavy microchannels Pin fins, lattices, and triply periodic minimal surfaces Thin fins Heat exchangers Conclusions and future needs References Chapter-Six---Progress-in-measuring--modeling--and-manip_2021_Advances-in-He Progress in measuring, modeling, and manipulating thermal boundary conductance Introduction Background Defining thermal boundary conductance Common assumptions Acoustic mismatch model Diffuse mismatch model Detailed balance Vibrational mismatch Methods Time domain thermoreflectance (TDTR) Modulation frequency and TDTR Nonequilibrium Green´s functions (NEGF) Connecting NEGF to mismatch models Classical molecular dynamics Defects Measure: Experimental observations Model: Insights from simulation Periodicity and conservation of wavevector Opening transport channels: Enhancement of h Transmission: Decrease of h Disorder, incoherence, and connections to superlattices Anharmonicity Measure: Experimental observations Model: Insights from simulation Abrupt interfaces Interfaces with intermediate layers Manipulate: Engineering thermal boundary conductance Experimental demonstrations Diffusion-promoted phonon bridge to enhance h Intermediate layer as phonon bridge Elastic contribution Inelastic contribution Extended intermediate layers Harmonic limit: Decrease in modes vs increase in transmission Anharmonic limit: A conductance maximum Conclusions and outlook References Back_Cover