Laminar Forced Convection and Heat Transfer Characteristics in a Square Channel Equipped with V-Wavy Surface

Abstract

Abstract:The numerical investigations on flow pattern and heat transfer characteristic in a heat exchanger channel equipped with Vwavy surface are examined. The influences of the flow attack angles (α = 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55° and 60°) and wavy surface arrangements (V-tip pointing downstream called "V-Downstream", Vtip pointing upstream called "V-Upstream) are investigated for laminar regime, Re = 100-1200. The finite volume method with SIMPLE algorithm is used to solve the current research. The numerical result shows that the addition of the wavy surface in the heat exchanger channel can help to develop the heat transfer rate and thermal performance. The wavy surface generates the vortex flow through the test section that disturbs the thermal boundary layer on the heat transfer surface. The insertion of the wavy surface in the heating channel gives higher heat transfer rate around 1.5-10 times above the smooth channel depended on the flow attack angle, Reynolds number and wavy surface arrangement. In addition, the optimum thermal performance is around 3.0 at Re = 1200, α = 40° and V-Upstream.

Effect of Flow Attack Angle for V-Wavy Plate on Flow and Heat Transfer in a Square Channel Heat Exchanger

“…(vi) The optimum flow attack angles of the wavy surface in the heat exchanger channel for laminar [17] and turbulent flow are 40 ∘ and 20 ∘ , respectively, when considered at the thermal enhancement factor.…”

“…As [17], similar configuration of the heat exchanger channel inserted with V-wavy surface is tested for the turbulent regimes in the present work. The influences of the flow attack angle on heat transfer and flow structure are performed.…”

“…Boonloi and Jedsadaratanachai [17] numerically investigated laminar flow and heat transfer in a square channel fitted with V-wavy plate. The V-wavy plate is a combination of the vortex generators between V-shaped baffle and wavy surface.…”

Influences of Flow Attack Angles and Flow Directions on Heat Transfer Rate, Pressure Loss, and Thermal Performance in Heat Exchanger Tube with V-Wavy Surface

“…e wavy surface helps a better fluid mixing and increases the vortex strength of the flow that causes for heat transfer and thermal performance developments in the heat exchanger. Boonloi and Jedsadaratanachai [19,20] reported the influences of the V-wavy plate in a square channel heat exchanger on thermohydraulic performance. ey claimed that the insertion of the V-wavy plate can increase the heat transfer rate and thermal performance with moderate pressure loss penalty.…”