To make carbon dioxide (CO2) heat exchangers in refrigeration systems more efficient and
compact, passive methods for heat transfer enhancement produced by tubes in various …

Most important challenge in evacuated tube solar collector is lower performance in off-pick
hours of sunlight which leads to utilizing thermal energy storage. In present study, thermal …

In this study, the use of corrugated surfaces as one of the passive heat transfer improvement
methods on straight tubes is numerically investigated related to the determination of Nusselt …

In the present work, a parabolic trough solar collector with inner helical axial fins as a swirl
generator is considered and analyzed. All the numerical outcomes are obtained by utilizing …

The present study numerically investigates a double pipe heat exchanger with a simple and
corrugated tube assuming three different wave amplitudes. The simulation is performed …

An experiment was conducted to gain the heat transfer and flow resistance characteristics of
a high-viscosity thermal oil and water in spiral twisted tube heat exchanger. Experimental …

Spirally corrugated tubes are widely used in thermal engineering, such as airconditionings
and heat pumps due to their advantages like extended surfaces for heat transfer …

In various applications such as air conditioning, refrigeration, central heating, and chemical
processing, heat losses due to thermal resistance are of considerable amount. To improve …

The flow and heat transfer characteristics of oscillatory flow in a smooth tube and two-start
spirally corrugated tube were investigated by using a three-dimensional unsteady numerical …

This study proposes a unique configuration for a three-period spirally fluted (3PSF) tube that
strengthens the flow mixing effect to enhance heat transfer. Conventional spirally fluted …