The influence of Dean Number on heat transfer to Newtonian fluid through spiral coils with constant wall temperature in laminar flow

2016 ◽  
Vol 53 (5) ◽  
pp. 1843-1850 ◽  
Author(s):  
Rahul Harishchandra Patil ◽  
Mariappan Dharmaraj Nadar ◽  
Rashed Ali
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Newtonian Fluid ◽  
Wall Temperature ◽  
Dean Number ◽  
Constant Wall Temperature ◽  
Spiral Coils

scholarly journals Laminar Flow Heat Transfer to Non-Newtonian Fluids in Vertical Tubes with Constant Wall Temperature

1969 ◽  
Vol 33 (7) ◽  
pp. 655-661,a1
Author(s):  
Nobuo Mitsuishi ◽  
Hirofumi Uchida ◽  
Osamu Miyatake
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Wall Temperature ◽  
Newtonian Fluids ◽  
Constant Wall Temperature ◽  
Flow Heat ◽  
Vertical Tubes

Thermal and Hydrodynamic Performance of Aqueous CuO and Al2O3 Nanofluids in an Annular Coiled Tube Under Constant Wall Temperature and Laminar Flow Conditions

2016 ◽  
Vol 138 (10) ◽  
Author(s):  
Wael I. A. Aly
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Laminar Flow ◽  
Transfer Coefficient ◽  
Wall Temperature ◽  
Base Fluid ◽  
Hydrodynamic Performance ◽  
Constant Wall Temperature ◽  
Coiled Tube ◽  
Tube Heat Exchanger

Laminar flow and heat transfer behaviors of two different metal oxide, Al2O3 (36 nm) and CuO (29 nm), nanofluids flowing through an annular coiled tube heat exchanger (ACTHE) with constant wall temperature boundary condition have been numerically studied to evaluate their superiority over the base fluid (water). Simulations covered a range of nanoparticles volume concentrations of 1.0–6.0% and mass flow rates from 0.025 to 0.125 kg/s. Numerical results indicated that a considerable heat transfer enhancement is achieved by both nanofluids. Results at the same Reynolds number for the pressure drop and heat transfer coefficient show an increase with increasing particle volumetric concentration. The maximum enhancements in heat transfer coefficient were 44.8% and 18.9% for CuO/water and Al2O3/water, respectively. On the other hand, the pressure loss was seven times in comparison to water for CuO/water and about two times for Al2O3/water nanofluid. Also, comparing to the base fluid, nanofluids at low concentrations (up to 3%) can provide the same heat transfer amount at lower pumping power. The overall performance of the enhanced heat transfer technique utilized has been evaluated using a thermohydrodynamic performance index which indicated that Al2O3/water nanofluid is a better choice than CuO/water nanofluid. Moreover, conventional correlations for helical circular tubes for predicting friction factor and average heat transfer in laminar flow regime such as the correlations of Mori and Nakayam and Manlapaz and Churcill, respectively, are also valid for water and the tested nanofluids with small nanoparticle loading in the ACTHE.

Heat Transfer in a Laminar Boundary Layer with Constant Fluid Properties and Constant Wall Temperature

1958 ◽  
Vol 62 (565) ◽  
pp. 60-64 ◽  
Author(s):  
A. G. Smith ◽  
D. B. Spalding
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Laminar Flow ◽  
Laminar Boundary Layer ◽  
Wall Temperature ◽  
Two Dimensional ◽  
Constant Wall Temperature ◽  
Simple Method ◽  
Flow Surface ◽  
Fluid Properties

A simple method is given for the calculation of the heat transfer from a laminar flow surface. Computation is by a quadrature. The method is essentially a simplification and extension of the Eckert(1) method, and is applicable both to two–dimensional and to axisymmetric flows.

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