Fish Gills: A New Approach to Heat Exchange Presented by: Drew May, Hannah Feldstein, Kyle McIlroy Professor: Junfeng Ma Presented on 4/26/16

Design Background Conceptual information and developing solutions

What is the purpose of Heat Exchange? Device used to redistribute the heat concentrations of two or more substances Usually uses fluids or gases High or low temperatures

Counter Current Flow Most efficient means of heat or concentration transfer Widely used in biological settings

What are the inefficiencies of design? Proposed models for heat exchange Fluid-fluid transfer Heat intermediary Limited by the constraints of traditional manufacturing Often the most efficient model for exchange is difficult to make Current models are restricted to parts that can be bored from solid blocks or assembled in sheets

Opportunities in Additive Manufacturing AM is the process in which a 3-D object is synthesized from the creative electronic design of an engineer FEW LIMITS!

Where can AM can benefit Heat Exchange? Surface area Versatility of design Organic shapes

Respiratory System Most effective material transfer on planet Huge surface areas Extremely permeable Evolutionarily proven

Scaling it Up A dynamic design based on a fishy origin

Gills Core-y High surface area-volume ratio Compact design More Weight! Gills Core-y High surface area-volume ratio Allows for effective heat exchange to occur along whole machine Compact design Gills have high frequency of compartments Weight is severely reduced

Corrugation Seen in cardboard Mimics the high-surface area of gills Low material cost

Difficulties in Development How to translate idea into CAD Linearization of a typically radial format Large-scale production feasibility

Translating to CAD Use of “series” tool Inversion and off-setting overlapping areas Mirrored multiple times Mating surface additions

Assimilation of Design Biology is often messy Needed to make this orderly so it can be efficient Created complete symmetry while maintaining core ideas

How to make this Large Scale? Patterns Trigonometric oscillations (0, pi, 2pi) Minimal material

What we Learned Can be difficult to translate a good idea into CAD There needs to be forethought before you begin to make progress Air-flow is dependent on the average volumetric path, heat transfer is dependent on surface area

Thanks & Questions