Abstract
In the present work, thermo-fluidic behavior of a heat exchanger tube with conical shaped insert has been investigated with the help of finite volume method. To enhance the heat transfer rate, two different types of roughness has been used in conical insert i.e. protrusion and dimple roughness. A three-dimensional computational model with RNG turbulence model is used for the simulation and it has been performed for three different diameters (3 mm, 6 mm and 9 mm) and two different pitch space (120 mm and 180 mm) for both protrusion and dimple roughness. The present model has been validated with Dittus-Boelter equation and with Blasius equation for Nusselt number and friction factor, respectively. For a constant heat flux of 1200 W/m2, effect of roughness, diameter and pitch on Nusselt number and friction factor has been predicted for Reynold number range of 5000 to 30000. From the result, it is found that, the protrusion shaped roughness has better thermal performance factor than dimple shape and diameter of 6 mm has performed better than 3 mm and 9 mm for both the cases of roughness due to favorable flow dynamics.
Highlights
With the increase in the world population, energy crises become a global problem which has a direct impact on the environmental and economic problems for a country
3.1 Validation To validate the present numerical model, a smooth tube has been modelled and its results were compared with Dittus-Boelter equation for Nusselt number and with Blasius equation for friction factor
All the results in the figure are calculated for a fixed value of pitch space of 120 mm. It can be observed from the figure, the value of Nusselt numbers increases with increase of Reynold number for smooth pipe as well as pipe with protrusion roughness
Summary
With the increase in the world population, energy crises become a global problem which has a direct impact on the environmental and economic problems for a country. Many researchers [14, 15, 18] have performed studies on conical turbulator inserts in the heat exchanger tube for improvement of heat transfer rate and hot shortness problem. To further enhance the performance of heat exchanger having conical turbulator, two different types of roughness have been investigated.
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