Physics

Reynolds number

Helix angle

Heat transfer

Mechanics

Mass flow rate

Biology

Intensity (physics)

Heat exchanger

Optics

Pressure drop

Engineering

Baffle

Composite material

Turbulence

Volumetric flow rate

Ecology

Materials science

Thermal

Nanofluid

Helix (gastropod)

Snail

Heat transfer coefficient

Drop (telecommunication)

Mechanical engineering

Thermodynamics

Case Studies in Thermal Engineering

In this study, shell and tube heat exchanger with non-continuous helical baffles (NCHB-STHX) is modeled numerically. This heat exchanger has varied applications in different fields of science and industry. The ratio of heat transfer coefficient to pressure drop (HTC/ΔP) is obtained from different angles and intensities. Helix angles vary from 20° to 40°, mass flow rate amounts are 0.984, 1.33 and 1.685 kg/s, and hybrid Nanofluid alumina-Cu-water with three different intensities 0.33, 1, and 2% were tested individually. In addition, the results were compared with pure water. Reynolds number ranges are between 25000 and 31000, and the K-ε RNG model was chosen as the most suitable one. Results show that the heat transfer at β = 20° is maximum and the optimum pressure drop occurs at β = 40°. Also, the helix angle β = 20°, 2% intensity of hybrid Nanofluid alumina-Cu-water and 1.685 kg/s flow rate thermal efficiency is maximum for the helix angle. As the Reynolds number increases up to 80%, HTC rises to approximately 84%. On the other hand, it declines gradually as the helix angle raises nearly 50% when it comes to alumina-Cu-water Nanofluid. The ratio (HTC/ΔP) is at its highest and has a 6% improvement compared to the previous study.

Investigation of thermal analysis and pressure drop in non-continuous helical baffle with different helix angles and hybrid nano-particles