Damkohler number - tradução para russo
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Damkohler number - tradução para russo

DIMENSIONLESS NUMBERS USED IN CHEMICAL ENGINEERING
Damkohler number; Damkholer number; Damkoler number; Dahmkoler number; Damkohler numbers; Damkoehler numbers
  • Damkohler plots

Damkohler number         

физика

число Дамкелера

atomic number         
  • An explanation of the superscripts and subscripts seen in atomic number notation. Atomic number is the number of protons, and therefore also the total positive charge, in the atomic nucleus.
  • Russian chemist [[Dmitri Mendeleev]], creator of the periodic table.
  • [[Henry Moseley]] in his lab.
  • [[Niels Bohr]], creator of the [[Bohr model]].
NUMBER OF PROTONS FOUND IN THE NUCLEUS OF AN ATOM
Atom number; Atomic numbers; Atomic Number; Proton number; Z (Atomic number); Z (atomic number); Number of protons; Nuclear charge number
атомный /порядковый/ номер (в таблице Менделеева)
telephone number         
  • A [[business card]] from [[Richard Nixon]]'s first Congressional campaign in 1946; his telephone number can be seen as "Whittier 42635"
  • Telephone numbers for sale in [[Hong Kong]].
  • 2008 photo shows a hairdressing shop in [[Toronto]] with an exterior sign showing the shop's telephone number in the old two-letters plus five-digits format.
  • Modern [[telephone keypad]] contains "*" and "#"
  • Face of a 1939 rotary dial showing a 2L-4N style alphanumeric telephone number LA-2697.
UNIQUE SEQUENCE OF DIGITS ASSIGNED TO A TELEPHONE SUBSCRIPTION
Telephone numbers; Phone number; Phone numbers; Directory number; Cellphone number; Phone Number; Tel. Nos.; Mobile device number; Mobile telephone number; Mobile directory number; Mobile dialable number; Phone Numbers
номер телефона

Definição

ВЕЩЕСТВЕННОЕ ЧИСЛО
то же, что действительное число.

Wikipédia

Damköhler numbers

The Damköhler numbers (Da) are dimensionless numbers used in chemical engineering to relate the chemical reaction timescale (reaction rate) to the transport phenomena rate occurring in a system. It is named after German chemist Gerhard Damköhler. The Karlovitz number (Ka) is related to the Damköhler number by Da = 1/Ka.

In its most commonly used form, the Damköhler number relates the reaction timescale to the convection time scale, volumetric flow rate, through the reactor for continuous (plug flow or stirred tank) or semibatch chemical processes:

D a = reaction rate convective mass transport rate {\displaystyle \mathrm {Da} ={\frac {\text{reaction rate}}{\text{convective mass transport rate}}}}

In reacting systems that include interphase mass transport, the second Damköhler number (DaII) is defined as the ratio of the chemical reaction rate to the mass transfer rate

D a I I = reaction rate diffusive mass transfer rate {\displaystyle \mathrm {Da} _{\mathrm {II} }={\frac {\text{reaction rate}}{\text{diffusive mass transfer rate}}}}

It is also defined as the ratio of the characteristic fluidic and chemical time scales:

D a = flow time scale chemical time scale {\displaystyle \mathrm {Da} ={\frac {\text{flow time scale}}{\text{chemical time scale}}}}

Since the reaction rate determines the reaction timescale, the exact formula for the Damköhler number varies according to the rate law equation. For a general chemical reaction A → B following the Power law kinetics of n-th order, the Damköhler number for a convective flow system is defined as:

D a = k C 0   n 1 τ {\displaystyle \mathrm {Da} =kC_{0}^{\ n-1}\tau }

where:

  • k = kinetics reaction rate constant
  • C0 = initial concentration
  • n = reaction order
  • τ {\displaystyle \tau } = mean residence time or space time

On the other hand, the second Damköhler number is defined as:

D a I I = k C 0 n 1 a k g {\displaystyle \mathrm {Da} _{\mathrm {II} }={\frac {kC_{0}^{n-1}a}{k_{g}}}}

where

  • kg is the global mass transport coefficient
  • a is the interfacial area

The value of Da provides a quick estimate of the degree of conversion that can be achieved. As a rule of thumb, when Da is less than 0.1 a conversion of less than 10% is achieved, and when Da is greater than 10 a conversion of more than 90% is expected. The limit D a {\displaystyle \mathrm {Da} \rightarrow \infty } is called the Burke–Schumann limit.

Como se diz Damkohler number em Russo? Tradução de &#39Damkohler number&#39 em Russo