Nomenclature
================================================================================

.. list-table::
	:header-rows: 1
	:align: center
	:widths: 1,4,1

	* - Symbol
	  - Description
	  - Units
	* - :math:`A`
	  - Coolant flow area
	  - m\ :sup:`2`
	* - :math:`A_{\text{CP}}, A_{\text{CI}}`
	  - Primary and intermediate coolant flow areas in the intermediate heat exchanger
	  - m\ :sup:`2`
	* - :math:`A_{\text{k}}`
	  - Coolant flow area of element :math:`k` in a liquid segment
	  - m\ :sup:`2`
	* - :math:`A_{\text{w}}`
	  - Wall area of a compressible volume
	  - m\ :sup:`2`
	* - :math:`A_{\text{inter}}`
	  - Area of liquid-gas interface
	  - m\ :sup:`2`
	* - :math:`a_{0} (i)`
	  -
	  - 1/m
	* - :math:`a_{1} (i)`
	  - Coefficients for liquid segment :math:`i`.
	  - 1/m-s
	* - :math:`a_{2} (i)`
	  -
	  - 1/m-s
	* - :math:`a_{3} (i)`
	  -
	  - 1/m
	* - :math:`a_{1} (j),...,a_{4} (j)`
	  - Coefficients in the simultaneous equations for the temperature changes at node :math:`j` in the intermediate heat exchanger
	  - J/m\ :sup:`2`-K
	* - :math:`\Delta a_{0} (k)`
	  -
	  - 1/m
	* - :math:`\Delta a_{1} (k)`
	  - Contributions from element :math:`k` in liquid segment :math:`i` to the
	  - 1/m-s
	* - :math:`\Delta a_{2} (k)`
	  - coefficients :math:`a_{0}\left( i \right)`, ..., :math:`a_{3}(i)`
	  - 1/m-s
	* - :math:`\Delta a_{3} (k)`
	  -
	  - 1/m
	* - :math:`b_{0} (j)`
	  - Coefficients in the pressure change expression for
	  - Pa
	* - :math:`b_{1} (j)`
	  - Compressible volume :math:`j`
	  - kg/m-s
	* - :math:`b_{2} (j)`
	  -
	  - kg/m-s-K
	* - :math:`C_1`, :math:`C_2`, :math:`C_3`
	  - Coefficients in electrical resisitivity correlation
	  - Ω/m, Ω/m-K, Ω/m-K\ :sup:`2`
	* - :math:`C`
	  - Electrical resisitivity proportionality constant
	  - --
	* - :math:`c_{\text{c}},c_{\text{l}}`
	  - Specific heat of coolant or liquid
	  - J/kg-K
	* - :math:`c_{\text{w}}`
	  - Specific heat of compressible volume or pipe wall
	  - J/kg-K
	* - :math:`{\overline{c}}_{\text{P}},\ {\overline{c}}_{\text{I}}`
	  - Spatially averaged primary and intermediate coolant heat capacities in the intermediate heat exchanger
	  - J/kg-K
	* - :math:`\overline{c}`
	  - Spatially averaged coolant heat capacity in the bypass
	  - J/kg-K
	* - :math:`C_{1},C_{2},C_{3}`
	  - User-supplied correlation coefficients in film heat-transfer calculation
	  - --
	* - :math:`c_{1} (j),...,c_{6} (j)`
	  - Coefficients in the simultaneous equations for the temperature changes at node :math:`j` in the intermediate heat exchanger
	  - J/m-K
	* - :math:`C_{0} (L,ic)`
	  - Coefficients in the expression for core channel
	  - kg/s\ :sup:`2`
	* - :math:`C_{1} (L,ic)`
	  - flow estimate in channel :math:`\text{ic}` at end :math:`L`
	  - m
	* - :math:`C_{2} (L,ic)`
	  - :math:`L` = 1 for inlet, 2 for outlet
	  - m
	* - :math:`C_{3} (L,ic)`
	  -
	  - 1/kg
	* - :math:`c_{\text{ij}}`
	  - Matrix in cover-gas pressure change equation
	  - ---
	* - :math:`c(I,J)`
	  - Matrix in compressible volume pressure change equation for liquid flow
	  - kg
	* - :math:`\Delta c(I,J)`
	  - Contribution to the matrix :math:`c(i,j)`
	  - kg
	* - :math:`D_{1},D_{2},D_{3}`
	  - Right side of simultaneous equation solution in the cover gas, intermediate heat exchanger, and bypass channel treatments
	  - W/m
	* - :math:`D,D_{\text{h}}`
	  - Hydraulic diameters
	  - m
	* - :math:`\text{DRACS}`
	  - Direct reactor auxiliary cooling system
	  -
	* - :math:`d_{\text{A}},d_{\text{B}},d_{\text{D}}`
	  - Reflector thicknesses in the bypass channel
	  - m
	* - :math:`d_{\text{SH}},d_{\text{TU}}`
	  - Shell and tube thicknesses in the intermediate heat exchanger
	  - m
	* - :math:`d_{1}`
	  - Coefficients in coolant-wall temperature
	  - J/m-K
	* - :math:`d_{2}`
	  - Calculations
	  - J/m\ :sup:`2`-K
	* - :math:`d_{5}`
	  -
	  - m-K/J
	* - :math:`d_{\text{j}}`
	  - Right side of cover-gas pressure change matrix equation
	  - Pa
	* - :math:`d(j)`
	  - Right side of liquid flow pressure change matrix equation
	  - kg\ :sup:`2`/m-s\ :sup:`2`
	* - :math:`\Delta d(j)`
	  - Contribution to :math:`d(j)`
	  - kg\ :sup:`2`/m-s\ :sup:`2`
	* - :math:`E_{\text{src}}`
	  - Heat source
	  - W/m\ :sup:`3`
	* - :math:`e_{1} (j),...,e_{10} (j)`
	  - Coefficients in the simultaneous equations for the temperature changes at node :math:`j` in the intermediate heat exchanger
	  -
	* - :math:`e_{0} (L,ic)`
	  - Coefficients in the expression for core channel
	  - kg/s
	* - :math:`e_{1} (L,ic)`
	  - flow estimate in channel :math:`\text{ic}` at end :math:`L`
	  - m-s
	* - :math:`e_{2} (L,ic)`
	  -
	  - m-s
	* - :math:`F_{\text{ij}}`
	  - Cover-gas flow rate from compressible volume i to compressible volume :math:`j`
	  - kg/s
	* - :math:`F_{0\text{ij}}`
	  -
	  - kg/s
	* - :math:`F_{1\text{ij}}`
	  - Coefficients in the expression for :math:`F_{\text{ij}}`
	  - m-s
	* - :math:`F_{2\text{ij}}`
	  -
	  - m-s
	* - :math:`F_Q`
	  - Fraction of pump heat to be modeled
	  - --
	* - :math:`f`
	  - Moody friction factor
	  - --
	* -
	  - power source frequency
	  - Hz
	* - :math:`f_{\text{r}}`
	  - Fraction of a coolant node at pipe inlet
	  - --
	* - :math:`f_{1} (j),...,f_{8} (j)`
	  - Coefficients in the simultaneous equations for the temperature changes at node :math:`j` in the intermediate heat exchanger
	  -
	* - :math:`f_{1},f_{2}`
	  - Fractions of reactor power
	  - --
	* - :math:`G`
	  - Specific flow rate
	  - kg/m\ :sup:`2`-s
	* - :math:`GH`
	  - Gravity head
	  - m
	* - :math:`G_{2}`
	  - Pressure drop parameter
	  - --
	* - :math:`g`
	  - Acceleration due to gravity
	  - m/s\ :sup:`2`
	* - :math:`H`
	  - Head
	  - m
	* - :math:`H_{\text{r}}`
	  - Pump reference head
	  - m
	* - :math:`H_{\text{SP}},H_{\text{PT}},H_{\text{TI}}`
	  - Overall heat-transfer coefficients for the intermediate heat exchanger
	  - W/m\ :sup:`2`-K
	* - :math:`H_{\text{AB}},H_{\text{BC}},H_{\text{CD}}`
	  - Overall heat-transfer coefficients between regions in the bypass channel
	  - W/m\ :sup:`2`-K
	* - :math:`H_{\text{snk}} A_{\text{snk}}`
	  - Heat transfer coefficient times area
	  - W/K
	* - :math:`(hA)_{\text{snk}}`
	  - Heat transfer coefficient times area
	  - W/K
	* - :math:`H_{\text{D}}`
	  - Steam drum total enthalpy
	  - J
	* - :math:`h_{\text{D}}`
	  - Specific enthalpy
	  - J/kg
	* - :math:`h_{\text{f}}`
	  - Liquid specific enthalpy
	  - J/kg
	* - :math:`h_{\text{g}}`
	  - Vapor specific enthalpy
	  - J/kg
	* - :math:`h_{\text{c}},h_{\text{CP}},h_{\text{CI}}`
	  - Coolant film coefficients
	  - W/m\ :sup:`2`-K
	* - :math:`h_{\text{w}},h_{\text{wc}}`
	  - Wall and wall-to-coolant heat-transfer coefficients
	  - W/m\ :sup:`2`-K
	* - :math:`h_{\text{FS}},h_{\text{fFT}}`
	  - Fouling factors in the intermediate heat exchanger
	  - W/m\ :sup:`2`-K
	* - :math:`I`
	  - Line-to-line total pump current
	  - A
	* - :math:`I_J`
	  - Line-to-line pump current through :math:`R_J`
	  - A
	* - :math:`I_D`
	  - Line-to-line pump current through :math:`R_D`
	  - A
	* - :math:`\text{IHX}`
	  - Intermediate heat exchanger
	  -
	* - :math:`K_{\text{cold}}`
	  - A cold leg pressure loss coefficient
	  - s\ :sup:`2`/m
	* - :math:`k_{\text{c}}`
	  - Coolant thermal conductivity
	  - W/m-K
	* - :math:`k_{\text{SH}},k_{\text{TU}}`
	  - Shell and tube thermal conductivities in the intermediate heat exchanger
	  - W/m-K
	* - :math:`L,L_{\text{i}}`
	  - Length
	  - m
	* - :math:`\Delta L(N)`
	  - Length-integrated volumetric heat source
	  - W/m\ :sup:`2`
	* - :math:`L_{\text{k}}`
	  - Length of element k in a liquid flow segment
	  - m
	* - :math:`L_{\text{n}}`
	  - Length of a node at pipe inlet
	  - m
	* - :math:`L_{\text{B}} / D_{\text{B}}`
	  - Length-to-diameter ratio per bend in an element
	  - --
	* - :math:`L_1`, :math:`L_2`
	  - Inductances in equivalent circuit pump models
	  - H
	* - :math:`M`
	  - Mach number for cover gas flow
	  - --
	* - :math:`M_{\text{D}}`
	  - Steam drum total mass
	  - kg
	* - :math:`M_{\text{w}}`
	  - Pipe wall mass per unit length
	  - kg/m
	* - :math:`\delta_{\text{m}}`
	  - Change in liquid mass
	  - kg
	* - :math:`\delta m_{\text{i}}`
	  - Change in cover gas mass in compressible volume :math:`i` during a sub-interval of time
	  - kg
	* - :math:`\Delta m,\Delta m_{\text{l}}`
	  - Change in liquid mass
	  - kg
	* - :math:`\Delta m_{\text{ji}}`
	  - Mass of cover gas flowing from compressible volume :math:`j` to :math:`i` during a sub-interval of time
	  - kg
	* - :math:`m(i)`
	  - Cover-gas mass in compressible volume :math:`i`
	  - kg
	* - :math:`m`
	  - Number of evaporators in parallel
	  - --
	* - :math:`m_{\text{g}}`
	  - Gas mass in a compressible volume
	  - kg
	* - :math:`m_{\text{r}}`
	  - Liquid mass in a compressible volume at a reference pressure
	  - kg
	* - :math:`\Delta m`
	  - Change in liquid mass in a compressible volume during a time sub-interval
	  - kg
	* - :math:`N_{\text{B}}`
	  - Number of bends in an element
	  - --
	* - :math:`P,P_{\text{er}},P_{\text{A}},P_{\text{D}},P_{\text{SP}},P_{\text{TI}}`
	  - Perimeters
	  - m
	* - :math:`P_{\text{s}}`
	  - Power shape for vertical section
	  - --
	* - :math:`p,p_{\text{l}}`
	  - Liquid pressure in a compressible volume
	  - Pa
	* - :math:`p_{\text{d}},p_{\text{d}1},p_{\text{d}2}`
	  - Pump head coefficients
	  -
	* - :math:`p_{\text{r}}`
	  - Reference liquid pressure in a compressible volume
	  - Pa
	* - :math:`\Delta p`
	  - Change in liquid pressure in a compressible volume during time sub-interval
	  - Pa
	* - :math:`p(i),p_{\text{g}}`
	  - Cover-gas pressure in compressible volume i
	  - Pa
	* - :math:`P_{1},P_{2}`
	  - Power shape normalization for Regions 1 and 2
	  -
	* - :math:`p(\text{JIN}),p(\text{JX})`
	  - Inlet and outlet plenum pressures in core flow estimate
	  - Pa
	* - :math:`\Delta p_{\text{i}}`
	  - Change in cover-gas pressure in compressible volume i during a sub-interval of time
	  - Pa
	* - :math:`p_{\text{in}} (i),p_{\text{out}} (i)`
	  - Pressures at the inlet and outlet of liquid segment i
	  - Pa
	* - :math:`\delta p`
	  - Change in liquid pressure
	  - Pa
	* - :math:`\Delta p_{\text{fr}} (i)`
	  - Frictional pressure loss in liquid segment i
	  - Pa
	* - :math:`\Delta p_{\text{w}2} (i)`
	  - Pressure loss proportional to the square of the flow in liquid segment i
	  - Pa
	* - :math:`\Delta p_{\text{v}} (i)`
	  - Valve pressure loss in liquid segment i
	  - Pa
	* - :math:`\Delta p_{\text{gr}} (i)`
	  - Gravity head in liquid segment i
	  - Pa
	* - :math:`\Delta p_{\text{p}} (i)`
	  - Pump head in liquid segment i
	  - Pa
	* - :math:`P_{\text{TOT}} Q_{\text{MULT}}`
	  - Reactor power for a time step
	  - W
	* - :math:`P_{\text{s}} (j)`
	  - Power shape by nodes
	  - --
	* - :math:`P1,P3`
	  - Power shape normalization factors
	  - --
	* - :math:`Q_{\text{A}},Q_{\text{B}},Q_{\text{D}}`
	  - Neutron and decay heating sources in reflectors
	  - W/m\ :sup:`3`
	* - :math:`\text{QMULT}`
	  - Power multiplication factor
	  - --
	* - :math:`q_{\text{c}}'`
	  - Linear heat rate in liquid element fluid
	  - W/m
	* - :math:`q_{\text{w}}'`
	  - Linear heat rate in liquid element wall
	  - W/m
	* - :math:`q_{\text{wa}}'`
	  - Linear heat rate in liquid element wall :math:`a`
	  - W/m
	* - :math:`q_{\text{wb}}'`
	  - Linear heat rate in liquid element wall :math:`b`
	  - W/m
	* - :math:`q,Q`
	  - Heat flow from compressible volume walls
	  - W/m\ :sup:`2`
	* -
	  - Region length-integrated sodium heat source w
	  - W/m\ :sup:`2`
	* -
	  - Length-integrated volumetric heat source
	  - W/m\ :sup:`2`
	* - :math:`Q`
	  - Heat removal rate
	  - --
	* -
	  - Volumetric flow rate
	  - m\ :sup:`3`/s
	* - :math:`R`
	  - Universal gas constant
	  - J/kg-K
	* - :math:`R_1`, :math:`R_D`, :math:`R_J`, :math:`R_M`
	  - Circuit resistances in equivalent circuit models
	  - Ω
	* - :math:`\text{Re}`
	  - Reynolds number
	  - --
	* - :math:`\text{Ri}`
	  - Richardson number
	  - --
	* - :math:`S`
	  - Slant height ratio of the tube-side in the intermediate heat exchanger
	  - --
	* - :math:`s`
	  - Pump speed
	  - 1/s
	* -
	  - Pump slip
	  - --
	* - :math:`T`
	  - Pump torque
	  - N-m
	* - :math:`T,T_{\text{g}}`
	  - Cover-gas temperature
	  - K
	* - :math:`T,T_{\text{l}}`
	  - Liquid temperature
	  - K
	* - :math:`T_{\text{c}},T_{\text{w}}`
	  - Coolant and wall temperatures
	  - K
	* - :math:`T_{\text{f}}`
	  - Friction torque loss
	  - N-m
	* - :math:`T_{\text{m}},T_{\text{p}}`
	  - Motor torque, pump torque
	  - N-m
	* - :math:`T_{\text{SH}},T_{\text{TU}}`
	  - Shell and tube node temperatures in the intermediate heat exchanger
	  - K
	* - :math:`{\overline{T}}_{\text{CP}},{\overline{T}}_{\text{CI}}`
	  - Spatially averaged coolant temperatures in the intermediate heat exchange
	  - K
	* - :math:`T(i)`
	  - Cover-gas temperature in compressible volume i
	  - K
	* - :math:`T_{\text{in}} (j),T_{\text{out}} (j)`
	  - Temperature of the incoming and outgoing fluid at compressible volume j
	  - K
	* - :math:`T_{\text{ji}}`
	  - Temperature of the cover-gas flowing from compressible volume j to i
	  - K
	* - :math:`T_{\text{B}}`
	  - Temperature of the flow from a bypass channel to the outlet plenum
	  - K
	* - :math:`T_{\text{C}}`
	  - Temperature of the flow from a core channel to the outlet plenum
	  - K
	* - :math:`T_{\text{snk}}`
	  - Temperature of the heat sink
	  - K
	* - :math:`T_{\text{Na,i}}`
	  - Sodium temperature in the i-th region
	  - K
	* - :math:`T_{\text{out}}`
	  - Outlet temperature in outlet plenum
	  - K
	* - :math:`T_{\text{out}} (t)`
	  - Steam generator outlet temperature
	  - K
	* - :math:`\delta T`
	  - Change in liquid temperature
	  - K
	* - :math:`\Delta T`
	  - Liquid temperature change during a time sub-interval
	  - K
	* - :math:`\Delta T_{\text{w}}`
	  - Wall temperature change during a time sub-interval
	  - K
	* - :math:`\Delta T_{\text{SH}}, \Delta T_{TU}`
	  - Shell and tube node temperature changes during a time sub-interval
	  - K
	* - :math:`\Delta T_{\text{CP}},\Delta T_{\text{CI}}`
	  - Coolant node temperature changes during a time a sub-interval
	  - K
	* - :math:`\Delta t`
	  - Time-step size
	  - s
	* - :math:`\Delta t_{\text{s}},\delta t`
	  - Sub-interval of a time step
	  - s
	* - :math:`U`
	  - Overall heat transfer coefficient
	  - W/m\ :sup:`2`-K
	* - :math:`u`
	  - Flow velocity
	  - m/s
	* - :math:`V(i),V_{\text{g}}`
	  - Cover-gas volume in compressible volume :math:`i`
	  - m\ :sup:`3`
	* - :math:`V_{\text{D}}`
	  - Steam drum volume
	  - m\ :sup:`3`
	* - :math:`v_{\text{D}}`
	  - Steam drum specific volume
	  - m\ :sup:`3`/kg
	* - :math:`v_{\text{j}}`
	  - Jet velocity at hot-cold interface
	  - m/s
	* - :math:`v`
	  - Liquid velocity
	  - m/s
	* - :math:`V,V_{\text{l}}`
	  - Liquid volume in a compressible volume
	  - m\ :sup:`3`
	* - :math:`V_{\text{r}}`
	  - Liquid volume in a compressible volume at a reference pressure
	  - m\ :sup:`3`
	* - :math:`V_s`
	  - Line-to-line voltage of pump power source
	  - V
	* - :math:`\Delta V_{\text{g}}`
	  - Change in cover gas volume
	  - m\ :sup:`3`
	* - :math:`\Delta V_{\text{l}}`
	  - Change in liquid volume
	  - m\ :sup:`3`
	* - :math:`w`
	  - Pump flow rate
	  - kg/s
	* - :math:`w(i)`
	  - Liquid flow rate in segment :math:`i`
	  - kg/s
	* - :math:`\overline{w}(i)`
	  - Time-averaged liquid flow rate in segment :math:`i`
	  - kg/s
	* - :math:`{\overline{w}}_{\text{in}}\left( i \right)`, :math:`{\overline{w}}_{\text{out}}\left( i \right)`
	  - Time-averaged liquid flow rate into and out from compressible volume :math:`j`
	  - kg/s
	* - :math:`{\overline{w}}_{\text{B}}`
	  - Average flow rate from a bypass channel into the outlet plenum
	  - kg/s
	* - :math:`{\overline{w}}_{\text{C}}`
	  - Average flow rate from a core channel into the outlet plenum
	  - kg/s
	* - :math:`w_{\text{c}} (L,ic)`
	  - Core flow rate in channel :math:`\text{ic}` at end :math:`L` at the beginning of the timestep
	  - kg/s
	* - :math:`\Delta w(i)`
	  - Change in the liquid flow rate in segment :math:`i` during a time sub-interval
	  - kg/s
	* - :math:`X_1`, :math:`X_2`
	  - Reactances in equivalent circuit pump models
	  - Ω
	* - :math:`z,z_{\text{r}},z_{\text{ref}}`
	  - Reference elevation
	  - m
	* - :math:`z_{\text{i}},z_{\text{inter}}`
	  - Liquid-gas interface elevation
	  - m
	* - :math:`z_{\text{in}},z_{\text{out}}`
	  - Height of element inlet and outlet
	  - m
	* - :math:`z_{\text{PLENL}}`
	  - Lower plenum elevation
	  - m
	* - :math:`z_{\text{PLENU}}`
	  - Upper plenum elevation
	  - m
	* - :math:`z_{\text{IHX}}`
	  - Reference height of the thermal center of the intermediate heat exchanger
	  - m
	* - :math:`\Delta z,\Delta z(j)`
	  - Height of the :math:`j`-th node
	  - m
	* - :math:`\alpha_{\text{P}}`
	  - Volume pressure expansion coefficient
	  - 1/Pa
	* - :math:`\alpha_{\text{T}}`
	  - Volume temperature expansion coefficient
	  - 1/K
	* - :math:`\alpha_{1},...,\alpha_{4}`
	  - Tri-diagonal matrix coefficients in the cover gas, intermediate heat exchanger, and bypass channel treatments
	  - W/m-K
	* - :math:`\beta_{\text{P}}`
	  - Liquid sodium compressibility
	  - 1/Pa
	* - :math:`\beta_{\text{T}}`
	  - Liquid sodium thermal expansion coefficient
	  - 1/K
	* - :math:`\beta_{1},...,\beta_{4}`
	  - Tri-diagonal matrix coefficients in the cover gas, intermediate heat exchanger , and bypass channel treatments
	  - w/m-K
	* - :math:`\gamma`
	  - Ratio of specific heat at constant pressure to that at constant volume
	  - --
	* - :math:`\gamma_{\text{N}1},\gamma_{\text{N}3}`
	  - Fraction of neutron power
	  - --
	* - :math:`\gamma_{\text{D}1},\gamma_{\text{D}3}`
	  - Fraction of decay power
	  - --
	* - :math:`\gamma(i)`
	  - Factor in the degree of implicitness in liquid segment :math:`i`
	  - --
	* - :math:`\gamma_{\text{c}} (L,ic)`
	  - Factor in the degree of implicitness in core channel :math:`\text{ic}` at end :math:`L`
	  - --
	* - :math:`\delta_{\text{ij}}`
	  - Kronecker delta symbol
	  - --
	* - :math:`\epsilon`
	  - Pump efficiency
	  - --
	* - :math:`\varepsilon ,\varepsilon (k)`
	  - Pipe roughness factor
	  - m
	* - :math:`\varepsilon_{\text{i}}`
	  - Factor in equation for cover-gas flow in compressible volume :math:`i`
	  - --
	* - :math:`\varepsilon_{\text{v}}`
	  - Cover-gas volume fraction
	  - --
	* - :math:`\xi`
	  - Ratio of shutoff head to design head
	  - --
	* - :math:`\rho,\rho_{\text{l}}`
	  - Liquid density
	  - kg/m\ :sup:`3`
	* - :math:`{\overline{\rho}}_{\text{P}},\ {\overline{\rho}}_{\text{I}}`
	  - Spatially averaged primary and intermediate coolant densities in the intermediate heat exchanger
	  - kg/m\ :sup:`3`
	* - :math:`\rho_{\text{I}},\rho_{0}`
	  - Fluid density at element inlet and outlet
	  - kg/m\ :sup:`3`
	* - :math:`(\rho c)_{\text{SH}},(\rho c)_{\text{TU}}`
	  - Shell and tube densities times specific heats in the intermediate heat exchanger
	  - J/m\ :sup:`3`-K
	* - :math:`(\rho c)_{\text{A}},(\rho c)_{\text{B}},(\rho c)_{\text{D}}`
	  - Densities times specific heats in the bypass channel
	  - J/m\ :sup:`3`-K
	* - :math:`\rho_r`
	  - Electrical resisitivity
	  - Ω
	* - :math:`\tau`
	  - Cover-gas time constant
	  - s
	* - :math:`\tau_{\text{m}},\tau_{\text{p}}`
	  - Motor torque, pump torque
	  - N-m
	* - :math:`\theta_{1} (i), \theta_{2} (i)`
	  - Degree of implicitness in the time differencing in liquid segment :math:`i`
	  - --
	* - :math:`\theta_{2\text{c}} (L,ic)`
	  - Degree of implicitness in the time differencing in core channel :math:`\text{ic}` at end :math:`L`
	  - --
	* - :math:`\phi`
	  - Phase angle between voltage and current
	  - --
	* - :math:`\Psi`
	  - circuit total resistance
	  - Ω

Subscripts 3 and 4 appended to quantities refer to the values of those
quantities at the beginning and at the end, respectively, of a time
interval.