When using aluminum foil to grill food, should the glossy side face up or the matte side up?

When using aluminum foil to grill food, should the glossy side face up or the matte side up?

Since aluminum foil has a shiny glossy side and a matte side, most of the resources you get when searching on search engines say this: When cooking food wrapped or covered in aluminum foil, the glossy side should face down, toward the food, and the matte side should face down. Glossy side up. This is because glossy is more reflective and therefore reflects more radiant heat than matte, allowing food to cook more easily.
Is it really? Let`s analyze it from the perspective of heat conduction:
Heat can be transferred in three basic ways: conduction, convection, and radiation. Conduction is when heat is transferred through one object in contact with another hot object. This is what happens when we cook on the stove.
Convection is the transfer of heat through the physical movement of a surrounding fluid (liquid or gas). Radiation is light waves, radio waves, microwaves, X-rays, etc. that transfer thermal energy from one surface to another.
Any object with a temperature above absolute zero emits infrared radiation. This means that the heated coils, sides and racks in the oven emit infrared energy. Even heated containers and heated food themselves release this energy.

However, when you cook food in an oven, the main source of cooking heat is convection. The hot air from the oven transfers heat to the food being cooked. Don't be confused by "convection oven". All ovens use convection, convection ovens only use fans to increase convection efficiency. Very little heat transfer in an oven is through infrared radiation, which is invisible light.

Glossy surfaces do not affect convection, but they do affect radiation. A shiny surface reflects more waves than a matte surface. The reason one side of aluminum foil is shinier than the other is that it is smoother and has fewer blemishes. Therefore, the shiny side of the foil should reflect more radiation than the matte side, which will capture the incident waves better, but it should not affect convection (convection is the main source of heat transfer).
Consider grilling food. When wrapping food in aluminum foil for baking, you may be tempted to leave the dull side out. In fact, either side works basically the same when baking food for a long time. The foil will be heated by convection and this energy will be transferred to the food, which will cook through steam as the moisture in the food heats up.

Rather than which side comes out, how tightly the food is wrapped may make a bigger difference. Any air trapped in the foil bag and surrounding the food may act as an insulating barrier, slowing the transfer of heat. Therefore, wrap food tightly before baking.
So when grilling food with aluminum foil, should the glossy side face up, or the matte side? You should have an answer to this question. At least as far as the heating effect is concerned, there shouldn't be much difference, so it can be decided by yourself.