HEAT & Mass TRANSFERCO RELATIONSPRESENTED BY

MUHAMMAD ALI

Outline

Co Relation for Spiral Plate Heat ExchangerRangasamy RAJAVEL 2014Department of Mechanical Engineering, AMET University, Chennai, India Original scientific paper

DOI: 10.2298/TSCI130317131R Sarma et al. Correlation 2006

For Subcooled CHF calculation

Co Relation for Spiral Plate Heat Exchanger

Experimental set-up Width of 304 mm Stainless Steel plate thickness of 1mm. The total heat transfer area is 2.24m2. Radius of curvature of 172.9 mm; The gap between the plate is 4 mm, 5 mm, and 6 mm. The flow rate was maintained between 0.2 and 1.0 kg/s.

Heated between 60 and 80 °C using a steam boiler.

Co Relation for Spiral Plate Heat Exchanger

Empirical correlation has been developed based on the experimental data. It was found that correlation of the type as

For Water System The Co relation is

This is Applicable in the following Range

Co Relation for Spiral Plate Heat Exchanger

Results The majority of the data falls within ±4%of the proposed correlation

The discrepancy between the experimental data and the predicted results is due to the difference in the configurations of test sections, the difference in the wall boundary conditions and uncertainty of the correlations

Sarma et al. Correlation 2006 Developed a subcooled CHF correlation (related to

Nuclear H T), by dimensional analysis of the CHF phenomena and heat balance,

and determined the constants in the equation by regression analysis of 3050 measured CHF data points, getting a mean deviation of 17 %.

It uses P in bar, D in meter, Lh in meter, liquid viscosity μ in Pa-s, mass flux G in kg/m2-s, and hfg in kJ/kg, giving

qc in kW/m2. The liquid viscosity μ is evaluated at the inlet temperature if P > 10 bar, and at the

saturation temperature if P ≤ 10 bar According to the Equation the CHF increases with diameter

as D^0.29. At constant G, P, Ti, and Lh, the CHF increases with increasing diameter while at constant G, P, Xo, the CHF decreases with increasing diameter2.