This document summarizes a presentation on flow through microchannels. It introduces microchannels as channels less than 1 mm in hydraulic diameter and discusses their history, applications, and areas for further development. The presentation describes modeling single-phase flow through different microchannel designs using ANSYS Fluent software. It validates the models by comparing their thermal resistance values to experimental data from Tuckerman and Pease. The results show temperature, pressure, and viscosity variations along the microchannels' lengths for different flow parameters. The conclusion indicates temperature-dependent properties cause the Reynolds number term to diminish and discusses how flow rate and fins affect thermal resistance.

1. FLOW THROUGH
MICROCHANNELSPresentedby:-
1) Rohit Dey
2) Niladri Das
3) Vishal Kumar
4) Debojyoti Biswas
-ME 4th Year

2. INTRODUCTION TO
MICROCHANNEL
 Microchannel in micro technology is a channel with a hydraulic
diameter below 1 mm.
 Effective Size range :-10 to 300 microns
 Classification of Microchannels :-
1. On basis of flow direction
2. On basis of crossection
3. On basis of fins
1

3. “
HISTORY AND
DEVELOPEMENT :-
 Microchannels were first proposed for electronics cooling
applications by Tuckerman and Pease 1981.
Phillips provided detailed
equations for designing microchannel geometries .
Colgan provided the results of a practical implementation
of enhanced microchannels with a strip-fin geometry.
Kandlikar and Upadhye presented a detailed optimization
procedure for selecting microchannel flow geometries.

4. Publication histogram showing papers related to single-phase
liquid heat transfer and fluid flow in microchannels

5. APPLICATION :-
◇ Cooling of electronics component
◇ Microcahnnel heat exchanger
◇ Microchannel reactor
◇ high-performance aircraft gas turbine engines
◇ Heat pumps
◇ Air conditioning

6. Relatively new topic of disscussion,so their is vast scope of
developement.
Miniaturization of electonic component requires more efficient
way of optimizing microchannel flows
Unique multiphase flow in microchannels
Microchannel-based MicroFluid devices using electric fields are
of recent research interest for various purposes
Field of Interest in Microchannel
Flow

7. Scope of Developement
 Geometric Optimization of the design of
microchannels in heat sinks and heat
exchanger.
 Establishing a stabilised study on multi
phase flow in microchannel.
Further study and developement on the
behaviour and effect of flow boiling.
Controlled initiation of turbulent flow in
microchannel.

8. Concluding the
best criterion for
heat transfer
OUR OBJECTIVE :-
Analysis of single
phase flow
through
Different
microchannels
Comparing
different results
due for different
flow parameters

9. Place your screenshot here
Software used :-
 For Designing :- CREO 3.0
 For Analysis :- ANSYS
Fluent 16.0

10. Place your screenshot here
COLOR
CODE
PARTS
Grey color
Chip
(heat source)
yellow microchannel
red Fluid domain
Cross sectional view of the model assembly

11. Case study - I Case study -II Case study-III
Ht 489 micrometer 489 micrometer 533 micrometer
Hc 280 micro meter 280 micrometer 320 micrometer
Wc 64 micro meter 64 micrometer 56 micrometer
Ws 36 micro meter 36 micrometer 44 micrometer
length 2cm 2cm 1.4cm

12. BASICDESIGNANDMESHING

13. GOVERNING EQUATION

14. TEMPERATUREDEPENDENTVARIABLEINDUCED

15. CASESTUDYI CASESTUDYII CASESTUDYIII
INLETVELOCITY 0.69m/s 0.475m/s 1.377m/s
PRESSUREOUTLET 0pa 0pa 0pa
HEATFLUX 34.6W/cm2 34.6W/cm2 181W/cm2
INLETTEMPERATURE 293K 293K 293K
BOUNDARY CONDITION

16. CASE Q W/cm^2 VOLUME
RATE
TUCKERMEN
EXPERIMENT
OUR EXPERIMENT
I 34.6 1.86 0.28 0.282
II 34.6 1.277 0.277 0.26
III 181 4.7 0.11 0.15
MODEL VALIDATION THROUGH THERMAL
RESISTANCE

17. RESULTS:- TEMPERATUREVSX(M)

18. RESULTS:- PRESSUREVSX(M)

19. COMPARISION OF VISCOSITY ALONG X(m)

20. CONCLUSION
• Due to temperature dependent properties the f.Re term is no more constant rather diminishes.
• With increase in flow rate the thermal resistance value decreases.
•With increase in number of fins H(coefficient of convection) increases.

21. Thanks!
Any questions?