Numerical Study on Heat Transfer and Release Characteristics of Key Components in Electrically Heated Tobacco Products

Table 1

Overview of boundary and initial conditions in the simulation.

Boundary and initial conditions	Conditions settings		Parameters
Boundary conditions	Inlet	Outlet of the filter section: velocity inlet with the velocity set according to the HCI puffing protocol	, in equations (1), (3)–(5)
	Outlet	Inlet of the tobacco section: pressure outlet with the gauge pressure set to 0
	Wall	Surface of the heating element: time-varying temperature based on experimentally measured data, as shown in Figure 2	, , , and in equations (1) and (2)
		Top and bottom of the heating element: heat flux = 0 W/m^2
		Outer walls: convective heat transfer boundary condition with heat transfer coefficient = 65.25 W/(m^2·K) and ambient fluid temperature = 300 K
		All walls: nonslip conditions
	Tobacco domain	Enthalpy source terms and mass transfer source terms loaded by the UDFs	, , and in equations (1), (2), and (5)
Initial conditions	All domains	Initial temperature = 26.85°C	and in equations (1) and (2)
		Initial velocity = 0	in equations (1), (3), (4), and (5)
		Initial pressure = 101325 Pa	in equations (1) and (3)
	Fluid domain	Mass fraction of air = 1	and in equations (4) and (5)
	Tobacco domain	Water content = 11.38 wt%; Glycerol content = 16.48 wt%; Nicotine content = 1.13 wt%

Note. “wt%” stands for “weight percent.”