Air%20flow%20and%20Thermal%20distribution%20in%20An%20Infant%20incubator%20Analysis%20By%20Using%20Finite%20Element%20Method - PowerPoint PPT Presentation

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Air%20flow%20and%20Thermal%20distribution%20in%20An%20Infant%20incubator%20Analysis%20By%20Using%20Finite%20Element%20Method

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Dome Shape. Hexagonal Shape. Temperature plot at head, body, foot of infant. Dome Shape. Hexagonal Shape. Incubator Model. Infant Model ... – PowerPoint PPT presentation

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Title: Air%20flow%20and%20Thermal%20distribution%20in%20An%20Infant%20incubator%20Analysis%20By%20Using%20Finite%20Element%20Method


1
Air flow and Thermal distribution in An Infant
incubator AnalysisBy Using Finite Element Method
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2
Outline
Introduction
Theory
Model and Metrology
Simulation Results
Future work
3
  • Introduction

4
????????? ????????????
  • ???????? 3 ?????????
  • ?????????? (Infant Chamber/Hood)
  • ?????????? (Control Unit/Section)
  • ??? (Cabinet)

Hood
Control
5
???????????????????????????????
  • ????????????????? (premature baby)
  • ??????????????, ???????????????????????????
  • ???? lt750 ???? gt2000 ????
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6
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    0.3 ??????
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7
??????????????
  • ???????????????????????????
  • ???? ? 35.5 C ??? 37.5C ????????
  • ????????????????????????????????????????????
    ????????
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    ?? ??????????????
  • ?????????????????????????
  • ???????? ? ??????????????????????????? 4.5 ??? 5
    W/kg
  • ????????????????????????????
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  • - ????????????? (Conduction) ???????????????????
    ????????????????????????????????
  • - ????????????? (Convection) ?
    ????????????????????????????????????
  • - ??????????? (Radiant) ? ???????????????????????
    ????????????????????????????????? ??????
  • - ???????? (Evaporation) ????????????????????????
    ??????????????????

8
(No Transcript)
9
  • Infant Incubator

10
  • Infant Incubator

11
  • Infant Incubator

12
  • Infant Incubator

13
????????? HOOD ????????
Single wall
Double wall
14
??????????????????????????
  • ?????????????????????????????????????????????
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15
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16
Variables Temperature, Velocity Field
17
Theory of Fluid Mechanics and Heat Transfer
18
Incompressible Navier-Stokes Equation
Dynamic Viscosity(Ns/m2)
Pressure (Pa)
Volume Force Field (N/m3)
Fluid Dynamics
19
Conduction and Convection Equation
T Temperature (K)
Q Heat Source (W)
C Heat Capacity (J/kgK)
K Isotropic Thermal Conductivity (W/mK)
Heat Transfer
20
Comsol multiphysics 3.4 a
21
4. Finite Element Method
Partial Differential Equation (PDE)
Boundary Condition
22
??????????????????????
23
Cubic shape
Pentagon shape
semi-hexagonal shape
velocity fields inside the incubator of each model
24
Stream Line
Hexagonal Shape
Dome Shape
25
Temperature plot at head, body, foot of infant
Hexagonal Shape
Dome Shape
26
Incubator Model
27
Infant Model
????????????????????? ??????? 3dsmax ???
Unigraphics NX
28
Material name Air Air
Axial initial velocity of the air uz 0.41 m/s
Air density ?a 1.43 kg/m3
Heat capacity of the air cp,a 1006 J/kgK
Thermal conductivity of the air ka 0.0268 W/mK
Viscosity of the air µa 1.90 x 10-5 kg/ms
Thermal expansion coefficient of the air ß 0.003326 1/K
29
Material name Infant Infant
Newborns weight 1500 (kg)
Newborns height 0.4 (m)

Age 1 (days)
Gestation 32 (weeks)
Tissue conductivity 0.34 W/mK
Tissue density 1000 kg/m3
Tissue specific heat 4000 J/kgK
Blood perfusion rate 1.8 (kg m-3 s-1)
Blood density 1050 kg/m3
Blood specific heat 3800 J/kgK
Initial temperature 308 K
30
Boundary condition of fluid dynamics
Fluid Dynamics Boundary Condition
Inflow u u0
Outflow P00
Chamber u0
Infant model u0
Boundary condition of heat transfer
Fluid Dynamics Boundary Condition
Inflow Temperature
Outflow Convective Flux
Chamber Thermal insulator
Infant model Temperature
31
Mesh of model
32
Initial value
33
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34
?????????????
35
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???????
36
Improvement
  • Other parameter, humid, Heat Loss
  • Real Situation and parameter,infant,room
  • Simulink with mathlab Control temperature

37
END
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