The influence of secondary refrigerant air chiller U-bends on fluid temperature profile and downstream heat transfer for laminar flow conditions

2008 ◽  
Vol 51 (3-4) ◽  
pp. 724-735 ◽  
Author(s):  
Richard Clarke ◽  
Donal P. Finn
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Temperature Profile ◽  
Fluid Temperature ◽  
Flow Conditions ◽  
Laminar Flow Conditions

Optimization of Mixed Hydrophilic and Hydrophobic Surfaces Under Laminar Flow Conditions

2020 ◽  
Author(s):  
Brian Frymyer ◽  
Alparslan Oztekin
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Thermal Resistance ◽  
Energy Barrier ◽  
High Energy ◽  
Film Condensation ◽  
Dropwise Condensation ◽  
Flow Conditions ◽  
Mass Collection ◽  
Laminar Flow Conditions

Abstract When condensation first forms on a surface, it starts as tiny droplets. As the surface continues to collect condensation, the droplets grow together and form a film. The film increases the thermal resistance of the system. It is possible to remove the fluid from the condensing surface before it develops into a film. Dropwise condensation has the capability of providing up to an order of magnitude higher heat transfer than film condensation. A hydrophobic surface is capable of sustaining dropwise condensation but creates a high energy barrier that restricts nucleation. A hydrophilic surface has a low energy barrier for nucleation but retains the water quickly transitioning to film condensation. A hydrophilic and hydrophobic patterned surface creates a surface with a low nucleation energy barrier and is capable of sustaining dropwise condensation. Surface patterns are evaluated under laminar flow conditions to maximize mass collection. The surfaces are evaluated using a thermal model, which includes an equivalent thermal resistance for diffusion. Laminar flow rates are evaluated using Reynolds numbers from 1,218 to 4 × 105. Hydrophilic nodules sizes are evaluated from 0.1 mm to 3.7 mm. Under natural convection flow, mass collection can be increased by 20% with respect to film heat transfer.

Heat Transfer to Non-Newtonian Fluid Foods under Laminar Flow Conditions in Horizontal Tubes

1987 ◽  
Vol 52 (4) ◽  
pp. 975-979 ◽  
Author(s):  
GRACIELA RODRíGUEZ-LUNA ◽  
JOSÉ SIMÓN SEGURAJAÚREGUI ◽  
JESÚS TORRES ◽  
EDMUNDO BRITO
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Newtonian Fluid ◽  
Flow Conditions ◽  
Horizontal Tubes ◽  
Fluid Foods ◽  
Laminar Flow Conditions
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