The phrase "a double duct" is correct and usable in written English.
It can be used in contexts related to plumbing, HVAC systems, or any situation where two ducts are involved.
Example: "The building's ventilation system was designed with a double duct to improve airflow efficiency."
Alternatives: "two ducts" or "dual duct system".
A mathematical model of a single pass, double duct solar air heater (SPDDSAH) is described.
In addition, the influence of the contoured duct of the deflecting ring on the noise generated by the outdoor set is analyzed and a double contoured duct is designed.
In the present paper, the entropy generation and optimal Reynolds number for developing forced convection in a double sine duct with various wall heat fluxes, which frequently occurs in plate heat exchangers, are studied based on the entropy generation minimization principle by analytical thermodynamic analysis as well as numerical investigation.
In this present work an exergy efficiency of the single pass double duct jet plate solar air heater (SPDDJPSAH) is analytically investigated.
The double duct sign, simultaneous dilation of the common bile and pancreatic ducts, typical in patients with adenocarcinoma of the pancreatic head, was only depicted in 5/14 PPLs [1, 14, 15, 16, 17].
using extended surfaces, packed bed, corrugated absorber were reported in the literature and found more increase in the thermal efficiency in comparison to conventional double duct solar air heater.
In the present paper, the entropy generation in a double-sine duct, which is frequently used in plate heat exchangers, is investigated by numerical methods.
Three typical test problems of flow in a gradual expansion duct, flow in a double bent channel, and natural convection between concentric and eccentric annuli have been calculated to indicate the feasibility and performances of the present formulation.
If the divisum is recognized, double duct-to-mucosa anastomosis, invagination anastomosis, or conventional pancreatoduodenectomy is needed [2, 5].
A mathematical model for drying agricultural products in a mixed-mode natural convection solar crop dryer (MNCSCD) using a single-pass double-duct solar air-heater (SPDDSAH) is presented.
